\"Zero-Basic Easy Repair of Inverter Air Conditioner\" adopts a zero-based explanation mode to comprehensively introduce the basic terms, external structure, internal circuit board, parts, maintenance skills, maintenance operations and other contents of inverter air conditioner. The whole book runs through the overall explanation idea of \"learning maintenance skills is learning inverter air conditioner components + circuit board\". While describing in words, it combines the necessary structure diagram, principle diagram, appearance diagram, parts diagram, tool diagram, and physical diagram to introduce the theoretical basis and maintenance operation skills of inverter air conditioner. \"Zero-Basic Easy Repair of Inverter Air Conditioner\" focuses on the parts and maintenance skills of inverter air conditioner, and explains in simple terms with pictures and texts, striving to make readers read easily and intuitively, so as to achieve the purpose of learning a skill step by step from zero. At the end of the book, rare technical information such as commonly used chips and fault codes of inverter air conditioners are also provided for readers\' reference. Preface Chapter 1 Learn the basics from scratch 1 Section 1 Basic concepts 1 1. Frequency conversion technology 1 2. CFC-free frequency conversion 1 3. The concept of frequency conversion air conditioner 2 4. Characteristics of frequency conversion air conditioner 2 5. The difference between frequency conversion air conditioner and fixed frequency air conditioner 3 6. DC frequency conversion air conditioner 4 7. AC frequency conversion air conditioner 4 8. Naming rules of frequency conversion air conditioner 4 Section 2 Basic terms 5 1. Refrigerant 5 2. Cooling and heating capacity 6 3. Energy efficiency ratio 6 4. Power, air volume and noise 6 5. Horsepower 6 6. Pressure and pressure 7 7. Air pressure 7 8. Temperature 7 9. Heat 8 10. Throttling and heat transfer 8 11. Physical state change 8 12. Artificial refrigeration or heating 9 13. Refrigerant oil 9 14. Peltier effect 9 15. Semiconductor refrigeration technology 9 16. Vacuuming 10 Chapter 2 Learn external structure easily 11 Section 1 Classification of frequency conversion air conditioners and inverters 11 1. Classification of frequency conversion air conditioners 11 1. Classification by product grade 11 2. Classification by compressor 11 3. Classification by throttling mechanism 12 4. Classification by structural form 12 5. Classification by number of indoor units 12 II. Classification of inverters 12 Section 2 Composition of inverter air conditioners 12 I. External composition of inverter air conditioners 12 II. Internal composition of inverter air conditioners 15 1. Internal composition of wall-mounted inverter air conditioners 15 2. Internal composition of cabinet inverter air conditioners 17 III. Composition of inverter controller 17 IV. Composition of inverter air conditioner system 17 1. Refrigeration (heating) system 17 2. Control system 18 3. Ventilation system 21 Section 3 Disassembly of inverter air conditioners 22 I. Disassembly of outdoor unit of inverter air conditioner 22 1. Disassembly of top plate 23 2. Disassembly of cover 23 3. Disassembly of electrical box 23 4. Disassembly of fan motor and bracket 24 5. Disassembly of pipe group and compressor 25 6. Disassembly of condenser 25 II. Disassembly of indoor unit of inverter air conditioner 27 III. Installation of cabinet air conditioner 29 1. Installation tools 29 2. Installation accessories 29 3. Selection of installation location 29 4. Length of indoor and outdoor unit connection pipes 30 5. Wall drilling 31 6. Pipeline connection 31 7. Exhaust method 32 8. Indoor and outdoor unit cable connection (Take Hitachi KFR-72LW/BPB air conditioner as an example 32 9. Test run and inspection after installation 35 IV. Installation of wall-mounted air conditioner 35 1. Selection of installation location 35 2. Installation of indoor unit wall plate 35 3. Pipeline installation 37 4. Outdoor unit installation 37 5. Indoor and outdoor unit line connection 37 6. Connection inspection 38 V. Matters needing attention when installing variable frequency air conditioner 39 1. Air conditioner installation location 39 2. Connection line 39 3. Ensure good grounding 40 4. Use special wiring 40 VI. Moving variable frequency air conditioner 40 1. Necessary tools for moving 40 2. Steps for disassembling air conditioner 41 3. Reinstallation of the air conditioner 42 Chapter 3 Learn the internal circuit board easily 44 Section 1 General overview of the internal whole machine 44 1. Overview of the internal circuit of the variable frequency air conditioner 44 2. Overview of the outdoor unit circuit board 44 Section 2 Overview of the operation of the variable frequency air conditioner 45 1. The control principle of the variable frequency air conditioner 45 2. The working process of the variable frequency air conditioner 46 3. The working principle of the AC variable frequency air conditioner 46 4. The working principle of the DC variable frequency air conditioner 48 5. The working process of the communication circuit of the variable frequency air conditioner 51 Chapter 4 Learn the parts easily 52 Section 1 General parts 52 1. Capacitors 52 1. Ceramic capacitors 52 2. Film capacitors 52 3. Electrolytic capacitors 52 2. Resistors 53 1. Fixed resistors 53 2. Varistors 54 3. Fuse resistors 54 4. PTC thermistors 55 3. Diodes 55 4. Transistors 55 5. Field effect transistors 55 6. Inductors 56 7. Relays 57 8. Integrated circuits 59 1. MCU 59 2. Memory 60 3. Inverter 60 4. Power block 60 5. Three-terminal regulator 61 IX. Optocoupler 61 X. Transformer 62 XI. Fuse tube 62 XII. Remote control receiver 62 THIRTEEN. Check valve 64 XIV. Dry filter 65 15. Temperature sensor 65 1. Indoor and outdoor ambient temperature sensor 66 2. Indoor pipe temperature sensor 66 3. Outdoor pipe temperature sensor 67 4. Outdoor compressor exhaust temperature sensor 68 16. Electronic expansion valve 68 17. Capillary tube 70 18. Fan assembly 70 1. Axial fan and motor 71 2. Centrifugal fan and motor 72 3. Crossflow fan and motor 72 4. Wind guide plate and motor 73 19. Solenoid four-way valve 76 20. Heat exchanger 76 1. Evaporator 77 2. Condenser 77 21. Stop valve 78 1. Two-way stop valve 79 2. Three-way stop valve 79 XXII. Gas-Liquid Separator 80 Section 2 Special Parts 81 1. Reactor 81 2. Power Module 82 3. Compressor 83 4. Inverter 85 Section 3 Precautions for Component Desoldering, Testing and Substitution 86 1. Testing of Capacitors 86 1. Testing of Fan Motor Capacitors 86 2. Testing of Electrolytic Capacitors 87 3. Testing of Fixed Capacitors 87 2. Testing of Resistors 88 1. Testing of Fixed Resistors 88 2. Testing of Varistors 88 3. Testing of Fuse Resistors 89 4. Testing of PTC Thermistors 89 3. Testing of Diodes 89 1. Method of Judging the Quality of Diodes with Multimeter 89 2. Method of Measuring the Reverse Breakdown Voltage of Diodes with Insulation Resistance Meter 89 4. Testing of Transistors 90 5. Testing of Field Effect Transistors 91 6. Testing of Inductors 91 1. Testing with Pointer Multimeter 92 2. Testing with Digital Multimeter 92 7. Testing of Integrated Circuits 92 1. General Testing Methods for Integrated Circuits 92 2.MCU detection 92 3. Memory detection 93 4. Three-terminal voltage regulator detection 93 5. Power thick film block detection 93 VIII. Relay detection 93 1. Relay contact resistance detection 93 2. Coil resistance detection 93 IX. Optocoupler detection 93 X. Fuse tube detection 94 XI. Transformer detection 95 XII. Remote control receiver detection 95 13. Check valve detection 95 XIV. Dry filter detection 95 15. Temperature sensor detection 96 16. Electronic expansion valve detection 96 17. Capillary detection 96 18. Fan assembly detection 97 1. Single-phase asynchronous motor or synchronous motor has problems 97 2. Air guide plate cannot swing normally 97 3. Indoor and outdoor fan assembly detection method 97 XIX. Solenoid four-way valve detection 98 1. Measure the solenoid valve line 98 2. Measure the solenoid coil 98 3. Measure the capillary temperature 98 4. Quick judgment method for cross-flow of four-way valve 99 20. Inspection of heat exchanger 100 1. Fault of heat exchanger 100 2. Inspection of heat exchanger 101 21. Inspection of stop valve 101 22. Inspection of gas-liquid separator 101 23. Inspection of reactor 102 24. Inspection of power module 102 1. Light bulb inspection method 102 2. Multimeter inspection method 102 3. Inspection method and precautions of power module 102 25. Inspection of compressor 103 Chapter 5 Easy maintenance skills 104 Section 1 Maintenance tools and instruments 104 I. Tools 104 1. Manual pipe cutter 104 2. Manual pipe bender 104 3. Expander 104 4. Expander punch 105 5. Sealing pliers 106 6. Triangular scraper 106 7. Capillary pliers 106 8. Wrench 107 9. Pliers 107 10. Screwdriver 107 11. Gas welding equipment 108 12. Electric soldering iron 109 13. Desoldering machine 110 14. Test pen 110 15. Electric welding machine 111 16. Vacuum pump 111 17. Refrigerant cylinder 111 18. Electronic scale 112 19. Liquid filling pipe 112 20. Liquid collecting valve 113 21. Nitrogen cylinder (with pressure reducer) 113 22. Refrigerant meter cylinder 113 23. Five-way repair valve 113 II. Instruments 113 1. Pressure vacuum gauge 113 2. Low pressure gauge 114 3. Multimeter 114 4. Insulation resistance meter 115 5. Clamp ammeter 115 6. Glass rod thermometer 115 7. Electronic halogen leak detector 116 8. Point thermometer 116 9. Autotransformer 116 10. Constant temperature drying oven 117 Section 2 Fault detection methods 117 I. General detection principles 117 1. Basic methods for troubleshooting inverter air conditioner faults 117 2. Basic methods for judging inverter air conditioner faults 118 3. Matters to be noted when repairing inverter air conditioners 119 4. Fault types of inverter air conditioners 120 II. Common detection methods 120 1. Method for judging the amount of refrigerant charged in inverter air conditioners 120 2. Method for judging whether the inverter air conditioner is short of refrigerant 121 3. Troubleshooting methods for inverter air conditioners that cannot run 121 4. Troubleshooting methods for inverter air conditioners that do not respond after being powered on 122 5. Troubleshooting methods for inverter air conditioners that stop running after a period of time 122 6. Troubleshooting methods for inverter air conditioners that shut down due to protection and display of codes 122 7. Troubleshooting methods for inverter air conditioners that cannot increase or decrease frequency (speed remains unchanged) and protective shutdown faults 123 8. Troubleshooting methods for inverter air conditioners that start frequently 124 9. Troubleshooting methods for inverter air conditioners that start difficultly 124 10. Troubleshooting methods for inverter air conditioners that suddenly shut down automatically during operation, and then shut down automatically after the indoor fan is started for a few minutes, while the outdoor unit still does not work 124 11. Troubleshooting methods for inverter air conditioners that do not operate indoor units 124 12. Troubleshooting methods for inverter air conditioners that do not operate outdoor units 124 13. Troubleshooting methods for inverter air conditioners that make loud noises during operation 125 14. Troubleshooting methods for inverter air conditioners that have a power indicator, but the signal cannot be transmitted when the operation button on the remote control is pressed 125 15. Troubleshooting methods for inverter air conditioners that occasionally work after starting up and running, but the cooling effect is poor 125 16. Troubleshooting methods for inverter air conditioners that operate the compressor,125 17. Troubleshooting methods for inverter air conditioner compressor running but poor cooling effect 126 18. Troubleshooting methods for inverter air conditioner indoor fan motor not running 126 19. Troubleshooting methods for inverter air conditioner communication abnormality 126 20. Troubleshooting methods for inverter air conditioner IPM failure 127 21. Troubleshooting methods for inverter air conditioner compressor overheating 127 Section 3 Machine receiving and handing over methods 127 1. Machine receiving method 127 2. Maintenance steps 127 3. Machine handing over method 128 Chapter 6 Easy maintenance operation 129 1. [Model phenomenon] AUX KFR-51LW/BPSF (3) inverter air conditioner, displaying fault code \"E5\" 129 2. [Model phenomenon] Changhong KFR-28GW/BP inverter air conditioner, not heating 129 3. [Model phenomenon] Changhong KFR-28GW/BP inverter air conditioner, after starting up, the running light and power light flash, and the high-efficiency light and timer light are off 130 4. [Model phenomenon] Changhong KFR-28GW/BP inverter air conditioner, the indoor fan motor is running, the compressor does not start, the high-efficiency light, running light, and power light are all on, and the timer light is off 130 5. [Model phenomenon] Changhong KFR-28GW/BP inverter air conditioner, the indoor fan motor is working normally, but the outdoor unit fan motor does not rotate, and the compressor stops after 10 minutes 132 6. [Model phenomenon] Changhong KFR-28GW/BP inverter air conditioner, the indoor unit is working normally, and when the outdoor unit is started, the power trip phenomenon occurs immediately 132 7. [Model phenomenon] Changhong KFR-28GW/BP inverter air conditioner, the indoor unit output is normal, but the outdoor unit does not work 133 8. [Model phenomenon] Changhong KFR-28GW/BP inverter air conditioner, outdoor unit does not start 133 9. [Model phenomenon] Changhong KFR-28GW/BP inverter air conditioner, after power on, use remote control to turn on the air conditioner and adjust the air conditioner to cooling state, both indoor and outdoor units do not run, and there is no \"beep\" sound from the buzzer; forced start-up, indoor and outdoor units run normally 134 10. [Model phenomenon] Changhong KFR-28GW/BP inverter air conditioner, indoor fan motor continues to run after remote control shutdown 134 11. [Model phenomenon] Changhong KFR-28GW/BP inverter air conditioner, does not cool after moving (indoor unit runs, outdoor compressor does not run), running light flashes 135 12. [Model phenomenon] Changhong KFR-28GW/BP inverter air conditioner, indoor temperature does not reach the set temperature during cooling, outdoor unit stops running 135 13. [Model phenomenon] Changhong KFR-28GW/BP inverter air conditioner, the high efficiency light and operation light on the indoor unit panel are off and the timer light flashes when heating. 135 14. [Model phenomenon] Changhong KFR-28GW/BP inverter air conditioner, the compressor and outdoor fan motor run for a few seconds and then stop when heating. 136 15. [Model phenomenon] Changhong KFR-28GW/BQ inverter air conditioner, cannot be turned on. 137 16. [Model phenomenon] Changhong KFR-28GW/BQ inverter air conditioner, the fan motor and compressor do not work after turning on, and the fault code \"16\" is displayed. 138 17. [Model phenomenon] Changhong KFR-28GW/BQ inverter air conditioner, the outdoor unit does not work. 139 18. [Model phenomenon] Changhong KFR-40GW/BM inverter air conditioner, automatically shuts down at irregular intervals. 140 19. [Model phenomenon] Changhong KFR-40GW/BM inverter air conditioner, does not turn on, and the displayed fault code means \"outdoor E2PROM abnormality\" 140 20. [Model phenomenon] Changhong KFR-40GW/BM inverter air conditioner, the whole machine does not respond after power on 140 21. [Model phenomenon] Daikin RX45HVILC inverter air conditioner, the whole machine does not respond after turning on the remote control 141 22. [Model phenomenon] Gree KFR-25GW/BP500 inverter air conditioner, the outdoor unit stops after cooling for more than ten minutes, and starts again after a few minutes, and the cooling effect is poor 142 23. [Model phenomenon] Gree KFR-25GW/BP inverter air conditioner, can be used during the day, but stops when used at night 142 24[Model phenomenon] Gree KFR-32GW/(32556)FNPa-4 inverter air conditioner, water leaks at the outlet of the indoor unit pipe after the unit is moved 142 25[Model phenomenon] Gree KFR-32GW/BM(F) inverter air conditioner, the outdoor unit stops immediately after starting, and the fault light is on 142 26[Model phenomenon] Gree KFR-50LW/BM(F) inverter air conditioner, the protection light is on after a few minutes of starting, and the fault self-diagnosis is protection \"4\" 143 27[Model phenomenon] Haier KFR-25GW×2/BPF inverter air conditioner, the outdoor unit works after starting, but the compressor stops as soon as it starts, and the outdoor unit also stops working for a while, the power light and timer light flash, and the operation light is off 143 28. [Model phenomenon] Haier KFR-25GW×2/BPF inverter air conditioner, remote control failure, the fault code prompted means \"bad communication circuit\" 143 29. [Model phenomenon] Haier KFR-26/35GW/02S (R2DBPXF) -S1 inverter air conditioner, the guide vane stepper motor does not work 144 30. [Model phenomenon] Haier KFR-26/35GW/02S (R2DBPXF) -S1 inverter air conditioner, does not work 144 31. [Model phenomenon] Haier KFR-26/35GW/02S (R2DBPXF) -S1 inverter air conditioner, indoor fan motor does not work 145 32. [Model phenomenon] Haier KFR-26/35GW/02S (R2DBPXF) -S1 inverter air conditioner, does not work in heating mode, no hot air is blown out 146 33. [Model phenomenon] Haier KFR-26GW/BP1 inverter air conditioner, the indoor unit operation light flashes, and the other two lights are off 146 34. [Model phenomenon] Haier KFR-26GW/BP2 inverter air conditioner, it can cool (or heat) after turning on, but after 2~3 minutes, the indoor power light flashes, the timer light flashes, the operation light is on, and the whole machine does not work 147 35. [Model phenomenon] Haier KFR-35GW/BP5 inverter air conditioner, after turning on, the indoor unit works, but the outdoor unit does not work 147 36. [Model phenomenon] Haier KFR-35GW/C (BPF) inverter air conditioner, it runs cooling when it is turned on for heating 148 37. [Model phenomenon] Haier KFR-35GW/HB (BPF) inverter air conditioner, the cooling and heating lights flash after a few minutes of turning on 148 38. [Model phenomenon] Haier KFR-36GW/DBPF inverter air conditioner, the indicator light is normal when it is just turned on for cooling, but after a few minutes the power light goes out, the timer light goes out, and the operation light flashes 148 39. [Model phenomenon] Haier KFR-48LW/A (BPF) inverter air conditioner, during heating and defrosting, the indoor fan motor cannot enter the cold wind prevention state 148 40. [Model phenomenon] Haier KFR-50LW/BPF inverter air conditioner, after running for 2 minutes, the outdoor unit stops, the power light goes out, and the timer light flashes once 149 41. [Model phenomenon] Haier KFR-50LW/BPF inverter air conditioner, the outdoor unit does not work 150 42. [Model phenomenon] Haier KFR-50LW/BP inverter air conditioner, the indoor unit operates normally after turning on, but the outdoor fan motor and compressor do not work after the operation light comes on. Press the wind direction button or temperature button on the remote control, and the indoor indicator light alarms without fault 150 43. [Model phenomenon] Haier KFR-50LW/BP inverter air conditioner, the indoor unit operates normally, but the outdoor unit does not work 151 44. [Model phenomenon] Haier KFR-50LW/BP inverter air conditioner, the whole machine has no response after turning on the machine with the remote control 151 45. [Model phenomenon] Haier KFR-58LW/BPF inverter air conditioner, the outdoor unit starts and stops working immediately after turning on the machine 152 46. [Model phenomenon] Haier KFR-58LW/N (BPJXF) inverter air conditioner, hot air comes out after turning on the machine in heating mode, and cold air comes out after a few minutes 153 47. [Model phenomenon] Haier KFR-58LWN (BPJXF) inverter air conditioner, no cooling, and the fault code displayed is \"E2\" 153 48. [Model phenomenon] Haier KFR-60LW/BPF inverter air conditioner, outdoor unit does not work or stops after working for tens of seconds to 2 minutes 154 49. [Model phenomenon] Haier KR (32G/A (F) + 50L/F) 70W/BP inverter air conditioner, does not cool after working for a period of time; it can cool after turning it off and then turning it on, but it can’t cool again soon 154 50. [Model phenomenon] Hisense KFR-2601GW/BP inverter air conditioner, does not cool, the outdoor fan motor rotates but the compressor does not rotate 154 51. [Model phenomenon] Hisense KFR-2601GW/BP inverter air conditioner, outdoor154 52. [Model phenomenon] Hisense KFR-2601GW/BP inverter air conditioner, it stops after cooling for a period of time, and the operation light, power light, and timer light flash. 155 53. [Model phenomenon] Hisense KFR-2606GW/BP inverter air conditioner, the indoor fan motor turns on and off shortly after it is turned on. 156 54. [Model phenomenon] Hisense KFR-2606GW/BP inverter air conditioner, the outdoor unit does not run, and the fault code displayed is \"communication failure\". 156 55. [Model phenomenon] Hisense KFR-2608GW/BP inverter air conditioner, it works normally when it is just turned on, but the outdoor unit stops after a few minutes and displays a communication failure (the operation and power lights are on). 157 56[Model phenomenon] Hisense KFR-2608GW/BP inverter air conditioner, the indoor fan motor does not rotate and reports a momentary power failure (the operating light and high-efficiency light are on) 158 57[Model phenomenon] Hisense KFR-2608GW/BP inverter air conditioner, the outdoor unit does not work 158 58[Model phenomenon] Hisense KFR-2608GW/BP inverter air conditioner, the indoor fan motor does not rotate in both cooling and heating states, the outdoor unit stops immediately after starting, and the indoor unit operating light and high-efficiency light are on 159 59[Model phenomenon] Hisense KFR-2608GW/BP inverter air conditioner, the indoor fan motor does not rotate during heating 159 60[Model phenomenon] Hisense KFR-2608GW/BP inverter air conditioner, the compressor does not work during heating, but the outdoor fan motor can rotate 160 61. [Model phenomenon] Hisense KFR-2608GW/BP inverter air conditioner, the operating light is on during heating, but the indoor fan motor does not rotate; the fan motor operates normally in cooling and air supply states 160 62. [Model phenomenon] Hisense KFR-26GW/11BP inverter air conditioner, the outdoor unit does not operate after remote control startup, and the indoor unit operating light is off. The fault means over- or under-voltage fault 161 63. [Model phenomenon] Hisense KFR-26GW/11BP inverter air conditioner, cannot be turned on with the remote control 161 64. [Model phenomenon] Hisense KFR-26GW/11BP inverter air conditioner, the indoor unit works but the outdoor unit does not work 162 65. [Model phenomenon] Hisense KFR-26GW/27FZBP inverter air conditioner, the indoor fan motor does not rotate 164 66. [Model phenomenon] Hisense KFR-26GW/27FZBP inverter air conditioner, the indoor function can operate, but the outdoor unit does not work, the power light on the outdoor unit baseboard is not on, and the fuse F03 (3.15A) is blown 164. 67. [Model phenomenon] Hisense KFR-26GW/27FZBP inverter air conditioner, the outdoor unit has power, the red indicator light is on, but the outdoor unit does not start, the power light is on, the timer light flashes, the operation light is on, and the high-efficiency light is off 164. 68. [Model phenomenon] Hisense KFR-26GW/27FZBP inverter air conditioner, the whole machine has no response after turning on the machine with the remote control 166. 69. [Model phenomenon] Hisense KFR-26GW/77ZBP inverter air conditioner, cannot cool, and the inverter compressor does not work 166. 70. [Model phenomenon] Hisense KFR-26GW/77ZBP inverter air conditioner, the indoor unit cannot work normally 168. 71. [Model phenomenon] Hisense KFR-26GW/77ZBP inverter air conditioner, the air guide plate does not work properly after operation 168 72. [Model phenomenon] Hisense KFR-26GW/77ZBP inverter air conditioner, the indoor unit works after power on, but the outdoor unit does not respond 169 73. [Model phenomenon] Hisense KFR-26GW/77ZBP inverter air conditioner, the outdoor unit fan does not rotate after power on 169 74. [Model phenomenon] Hisense KFR-26GW/77ZBP inverter air conditioner, the whole unit does not respond after power on 169 75. [Model phenomenon] Hisense KFR-2801GW/BP inverter air conditioner, it is normal when it is just turned on, but reports voltage detection failure after working for dozens of minutes 171 76[Model phenomenon] Hisense KFR-2801GW/BP inverter air conditioner, malfunction (sometimes the whole unit does not work, sometimes the indoor unit works but the outdoor unit does not work) 171 77[Model phenomenon] Hisense KFR-2801GW/BP inverter air conditioner, cannot be started manually or by remote control, and the display screen and buzzer do not respond 172 78[Model phenomenon] Hisense KFR-3002GW/BP inverter air conditioner, stops irregularly during operation and cannot cool 172 79[Model phenomenon] Hisense KFR-3501GW/BP inverter air conditioner, the outdoor unit does not operate after working for a few minutes 172 80[Model phenomenon] Hisense KFR-3502GW/BP inverter air conditioner, after turning on the machine and running for a few minutes with heating, the compressor stops working and the indoor unit changes to ventilation state 172 81. [Model phenomenon] Hisense KFR-3502GW/BP inverter air conditioner, the outdoor unit does not work during cooling, and reports a power module failure 173 82. [Model phenomenon] Hisense KFR-35GW/77ZBP inverter air conditioner, the indoor fan motor does not rotate after turning on, and the outdoor unit power supply relay cannot be energized 173 83. [Model phenomenon] Hisense KFR-35GW/77ZBP inverter air conditioner, can cool, but the compressor keeps running 174 84. [Model phenomenon] Hisense KFR-35GW/77ZBP inverter air conditioner, can cool and heat, but the display screen has no display 175 85. [Model phenomenon] Hisense KFR-35GW/77ZBP inverter air conditioner, the indoor unit operates normally, but the outdoor unit does not operate 175 86. [Model phenomenon] Hisense KFR-35GW/77ZBP inverter air conditioner cannot be turned on with the remote control 176 87[Model phenomenon] Hisense KFR-5001LW/BP inverter air conditioner, the indoor fan motor turns on and off 177 88[Model phenomenon] Hisense KFR-5001LW/BP inverter air conditioner, the machine turns on and off when heating 177 89[Model phenomenon] Hisense KFR-50L/39BP inverter air conditioner, the indoor fan motor does not turn on in heating state, and is normal in cooling 177 90[Model phenomenon] Hisense KFR-50LW/39BP inverter air conditioner, cannot be turned on by remote control or forced start 178 91[Model phenomenon] Hisense KFR-50W/26VBP inverter air conditioner, the fan motor runs after turning on, but the compressor does not start, and the self-diagnostic fault is sensor fault (on, on, off) 179 92. [Model phenomenon] Hisense KFR-50W/39BP inverter air conditioner, after starting up, the fan motor rotates, the compressor automatically stops, and the displayed fault code means current overload protection (LED1, LED2, LED3 are on, flashing, off) 179 93. [Model phenomenon] Hisense KFR-5201LW/BP inverter air conditioner, the compressor does not start, but the indoor and outdoor fan motors work 180 94. [Model phenomenon] Hisense KFR-6001LW/BP inverter air conditioner, the indoor unit works normally, but the outdoor compressor does not work, and the outdoor fan motor runs periodically (that is, it runs for more than ten seconds and stops for a few minutes) 181 95. [Model phenomenon] Hisense KFR-6001LW/BP inverter air conditioner, cannot be turned on by remote control or forced startup 181 96. [Model phenomenon] Hisense KFR-60LW/BP inverter air conditioner, poor cooling effect, works for a few minutes after starting up and then stops, but starts up again after a few minutes, and repeats this process 181 97. [Model phenomenon] Hisense KFR-7001LW/BP inverter air conditioner, the whole unit does not work after being powered on 181 98. [Model phenomenon] Hisense Kelon KFR-35GW/08FZBP inverter air conditioner, no cooling (indoor and outdoor units operate normally, but no cold air is blown out) 182 99. [Model phenomenon] Hisense Kelon KFR-35GW/08FZBP inverter air conditioner, the indoor cross-flow fan motor of the Hisense Kelon KFR-35GW/08FZBP inverter air conditioner is running, but the outdoor compressor is not running 183 100. [Model phenomenon] Hisense Kelon KFR-35GW/08FZBP inverter air conditioner, the fault code \"6\" is displayed on the indoor unit display 183 101[Model phenomenon] Hisense Kelon KFR-72LW/36FZBPC inverter air conditioner, the outdoor unit stops working after a few minutes of operation 184 102[Model phenomenon] Kelon KFR-28GW/BP inverter air conditioner, the startup display and remote control are normal, but the outdoor unit does not start 186 103[Model phenomenon] Kelon KFR-28GW/BP inverter air conditioner, the compressor stops irregularly 186 104[Model phenomenon] Midea KFR-35GW/BP3DY-F (3) inverter air conditioner, poor cooling effect 186 105[Model phenomenon] Midea KF-26GW/BP2Y-M inverter air conditioner, the machine automatically stops after power on187 106【Model phenomenon】Midea KF-35GW/BP2DY-M (4) inverter air conditioner, the indoor unit makes a \"buzzing\" sound after turning on the air conditioner 187 107【Model phenomenon】Midea KFR-23GW/BP2DN1Y-M (3) inverter air conditioner, poor cooling effect, the whole machine has the fault code \"E1\" from time to time 188 108【Model phenomenon】Midea KFR-26GW/BP2DN1Y-E (3) inverter air conditioner, the indoor unit displays the fault code \"E1\" 188 109【Model phenomenon】Midea KFR-26GW/BP2DN1Y-H (3) inverter air conditioner, poor cooling effect after new installation 188 110【Model phenomenon】Midea KFR-26GW/BP2DY-E inverter air conditioner, noise 189 111[Model phenomenon] Midea KFR-26GW/BP2DY-M inverter air conditioner, no cooling, indoor unit displays fault code \"E1\"; but sometimes the air conditioner works normally 189 112[Model phenomenon] Midea KFR-26GW/BP2DY-M (4) inverter air conditioner, outdoor unit does not work, and there is no fault code 189 113[Model phenomenon] Midea KFR-26GW/BP2DY-M+ (4) inverter air conditioner, the remote control sometimes works, sometimes does not; but the air conditioner works normally when the manual forced switch is pressed 189 114[Model phenomenon] Midea KFR-26GW/BP2DY-M inverter air conditioner, water leaks from the lower corner of the indoor unit after the newly installed air conditioner has been working for a period of time 190 115[Model phenomenon] Midea KFR-26GW/BP2DY-M inverter air conditioner, poor cooling effect 190 116[Model phenomenon] Midea KFR-26GW/BPY-R inverter air conditioner, displays fault code \"P2\" 190 117[Model phenomenon] Midea KFR-26GW/I1BPY inverter air conditioner, after a few minutes of power on, both the indoor and outdoor units stop working, and the indicator light flashes 191 118[Model phenomenon] Midea KFR-26W/BP2-110 inverter air conditioner, poor cooling effect, indoor unit displays fault code \"E1\" 191 119[Model phenomenon] Midea KFR-27GW/BMⅡ inverter air conditioner, no cooling, outdoor unit starts and stops 191 120[Model phenomenon] Midea KFR-27GW/BMⅡ inverter air conditioner, no heating, cooling is normal 191 121[Model phenomenon] Midea KFR-27GW/BM inverter air conditioner, IPM protection, communication abnormality 192 122. [Model phenomenon] Midea KFR-27GW/BM inverter air conditioner, protection appears when starting, timer light goes out, operation light turns on, fault light turns off 192 123. [Model phenomenon] Midea KFR-27GW/BM inverter air conditioner is newly installed, the outdoor unit will go into protection after running for a few minutes during cooling, and cannot cool 192 124. [Model phenomenon] Midea KFR-27GW/BM inverter air conditioner, the indoor unit runs at high speed during heating, the outdoor unit does not work, and after a while the indicator light flashes for protection 192 125. [Model phenomenon] Midea KFR-32GW/BM (F) inverter air conditioner, the outdoor unit does not work 192 126. [Model phenomenon] Midea KFR-32GW/BM (F) inverter air conditioner, the outdoor unit stops immediately after starting, lights 1 and 3 turn on, and light 2 flashes 193 127. [Model phenomenon] Midea KFR-32GW/BM (F) inverter air conditioner, after starting in heating mode, the outdoor fan motor runs, but the compressor does not work. 193 128. [Model phenomenon] Midea KFR-32GW/BM (F) inverter air conditioner, after running in cooling mode for a few minutes, the outdoor unit stops, and restarts again a few minutes later, and starts again in this way repeatedly. 193 129. [Model phenomenon] Midea KFR-32GW/BP2DN1Y-H (3) inverter air conditioner, the cooling effect is poor after installation. 194 130. [Model phenomenon] Midea KFR-32GW/BP2DY-H (4) inverter air conditioner, the compressor does not start in cooling mode, and the fault code \"P0\" is displayed. 194 131. [Model phenomenon] Midea KFR-32GW/BP2DY-H (4) inverter air conditioner, the heating effect is poor. 194 132. [Model phenomenon] Midea KFR-32GW/BP2DY-M (4) inverter air conditioner, the compressor cannot run during cooling, and the fault code \"P43\" is displayed. 194 133. [Model phenomenon] Midea KFR-32GW/BP2Y inverter air conditioner, the screen displays the fault code \"P0\"; when the outdoor unit is turned on, the indicator LED2 is on and LED3 is off. 195 134. [Model phenomenon] Midea KFR-32GW/BP inverter air conditioner, the red light protection is on when the air conditioner is turned on. 196 135. [Model phenomenon] Midea KFR-32GW/BP inverter air conditioner, the whole unit does not start. 196 136. [Model phenomenon] Midea KFR-32GW/BP inverter air conditioner, the fault light is on during cooling, and the self-diagnosis is \"abnormal electromagnetic four-way valve\" 196 137[Model phenomenon] Midea KFR-32GW/BP inverter air conditioner, the compressor does not work during heating, and the outdoor fan motor runs for a few minutes before the whole machine is protected. 197 138[Model phenomenon] Midea KFR-32GW/BP inverter air conditioner, the compressor does not start during heating, but the indoor fan motor works, without cold wind protection. 197 139[Model phenomenon] Midea KFR-32GW/I1BPY inverter air conditioner, the defrost light, timer light, automatic light, and operation light flash after startup. 197 140[Model phenomenon] Midea KFR-32GWA/BP inverter air conditioner, the outdoor unit does not work after startup, and the displayed fault code means \"communication abnormality\". 197 141[Model phenomenon] Midea KFR-32GWA/BP inverter air conditioner, the indoor fan motor turns and stops during heating, and the operation light flashes after a few minutes, and the fault light and timing light are on. 198 142. [Model phenomenon] Midea KFR-32GWA/BP inverter air conditioner, the outdoor unit works for a few seconds and then stops after being turned on, then works for a few seconds and then stops again, and repeats this process 198 143. [Model phenomenon] Midea KFR-32GWA/BP inverter air conditioner, the indoor unit is always in the cold wind protection state 199 144. [Model phenomenon] Midea KFR-32GWA/BP inverter air conditioner, the compressor starts frequently 199 145. [Model phenomenon] Midea KFR-32GWA/BP inverter air conditioner, the cooling effect is poor 199 146. [Model phenomenon] Midea KFR-32GWA/BP inverter air conditioner, the protection light turns on after being turned on for a few minutes in the heating state 199 147. [Model phenomenon] Midea KFR-35GW/BP2DN1Y-H (3) inverter air conditioner, the cooling effect is poor 200 148[Model phenomenon] Midea KFR-35GW/BP2DNIY-M3 (I) inverter air conditioner, water leakage occurs within a few tens of minutes after startup 200 149[Model phenomenon] Midea KFR-35GW/BP2DY/M inverter air conditioner, compressor trips and stops during cooling, and cooling effect is poor 200 150[Model phenomenon] Midea KFR-35GW/BP2DY-E inverter air conditioner, cannot work, indoor unit displays fault code \"E1\" 200 151[Model phenomenon] Midea KFR-35GW/BP2DY-E inverter air conditioner, does not cool, displays fault code \"P0\" 201 152[Model phenomenon] Midea KFR-35GW/BP2DY-E inverter air conditioner, displays fault code \"P0\" shortly after startup 201 153. [Model phenomenon] Midea KFR-35GW/BP2DY-H (4) inverter air conditioner, poor cooling effect 201 154. [Model phenomenon] Midea KFR-35GW/BP2DY-M (4) inverter air conditioner, after starting up, the indoor and outdoor units work for a few minutes and then the outdoor unit stops. After repeating this several times, the indoor unit displays the fault code \"E1\" 201 155. [Model phenomenon] Midea KFR-35GW/BP2DY-M inverter air conditioner, after starting up, the fault code \"P1\" is displayed 202 156. [Model phenomenon] Midea KFR-35GW/BP2DY-M inverter air conditioner, cannot heat, but cools normally 202 157. [Model phenomenon] Midea KFR-35GW/BP2DY-M inverter air conditioner, the outdoor unit sometimes makes a \"buzzing\" sound when working 202 158. [Model phenomenon] Midea KFR-35GW/BP2DY-M inverter air conditioner, the outdoor unit has a loud noise 202 159. [Model phenomenon] Midea KFR-35GW/BP3DN1Y-C inverter air conditioner, the cooling effect is poor, the whole machine has a protection fault, the fault code is \"P2\" or \"P0\" 203 160. [Model phenomenon] Midea KFR-35GW/BP3DN1Y-C inverter air conditioner, indoor unit displays fault code \"E1\" 203 161. [Model phenomenon] Midea KFR-35GW/BPY-R inverter air conditioner, screen displays fault code \"E1\" 203 162. [Model phenomenon] Midea KFR-35GW/BPY-R inverter air conditioner, screen displays fault code \"P0\" 203 163. [Model phenomenon] Midea KFR-35GW/BPY-R inverter air conditioner, indoor unit and outdoor fan motors work during cooling, but the compressor does not start 204 164. [Model phenomenon] Midea KFR-36GW/BPY inverter air conditioner, module overcurrent protection appears after startup 205 165. [Model phenomenon] Midea KFR-45GW/BPY inverter air conditioner, no cooling, timer light, defrost light, automatic light, work light flash at the same time 205 166[Model phenomenon] Midea KFR-50LW/BPY inverter air conditioner, screen display fault code \"P01\" 205 167[Model phenomenon] Midea KFR-50LW/BPY inverter air conditioner, screen display fault code \"P09\" 206 168[Model phenomenon] Midea KFR-50LW/BPY inverter air conditioner, display fault codes \"P2\" and \"P9\" 206 169[Model phenomenon] Midea KFR-50LW/BPY inverter air conditioner, after heating for dozens of minutes, the outdoor unit stops for protection, and can be turned on again after a few minutes, and this repeats 206 170[Model phenomenon] Midea KFR-50LW/FBPY inverter air conditioner, poor cooling effect, display fault code \"P09\" after running for dozens of minutes 206 171. [Model phenomenon] Midea KFR-50LW/FBPY inverter air conditioner, the whole machine is protected after cooling for a few minutes, and the fault code \"P02\" is displayed. 207 172. [Model phenomenon] Midea KFR-50LWX/BMF inverter air conditioner, the outdoor unit often starts automatically, and there is no fault display on the indoor unit. 207 173. [Model phenomenon] Midea KFR-51LW/BP2DY-E inverter air conditioner, it does not heat when turned on, the indoor unit has a display, and the outdoor unit has no response, and the fault code \"P0\" is displayed. 207 174. [Model phenomenon] Midea KFR-60LW/MBPY inverter air conditioner, the indoor and outdoor units have no response after turning on, and there is no fault code display. 207 175. [Model phenomenon] Midea KFR-60LW/MBPY inverter air conditioner, the screen displays the fault code \"P1\" 207 176[Model phenomenon] Midea KFR-61LW/FBPY inverter air conditioner, displayed fault code \"P01\" 208 177[Model phenomenon] Midea KFR-72LW/BP2DY-E inverter air conditioner, after being turned on for dozens of minutes, water leakage appeared on the right side of the indoor unit 208 178[Model phenomenon] Midea KFR-72LW/BP2DY-E inverter air conditioner, displayed fault code \"P2\" after being turned on 208 179[Model phenomenon] Midea KFR-72LW/BP2DY-E inverter air conditioner, newly installed, displayed fault code \"P1\" after being turned on 209 180[Model phenomenon] Midea KFR-72LW/BP2DY-E inverter air conditioner, the sliding door cannot be opened automatically, and the screen displays fault code \"E9\" 209 181[Model phenomenon] Mitsubishi KFR-26GW/BPY-R inverter air conditioner, shutdown for protection during operation, display fault code \"P2\" 209 ·ⅩⅦ·182[Model phenomenon] Mitsubishi KFR-26GW/BPY-R inverter air conditioner, shutdown after dozens of minutes of startup, screen display fault code \"E1\" 210 183[Model phenomenon] Mitsubishi KFR-32GW/I1BPY inverter air conditioner, indoor fan motor stops after a few minutes of startup, all indicator lights flash 210 184[Model phenomenon] Mitsubishi KFR-32GW/I1BPY inverter air conditioner, 4 indicator lights flash at the same time when powered on 210 185[Model phenomenon] Mitsubishi KFR-35GW/BPY-R inverter air conditioner, indoor unit stops working after startup, display fault code \"E1\" 210 186[Model phenomenon] Mitsubishi KFR-35GW/BPY-R inverter air conditioner, the fault code \"P0\" is displayed after power on 210 187[Model phenomenon] Mitsubishi KFR-35GW/BPY-R inverter air conditioner, the compressor does not start after power on, but the indoor and outdoor fan motors work 211 188[Model phenomenon] Mitsubishi KFR-35GW/BPY-R inverter air conditioner, the outdoor unit does not start, and the fault code \"E1\" is displayed 211 189[Model phenomenon] Mitsubishi KFR-35GW/BPY-R inverter air conditioner, the whole machine does not start after power on, and the fault code \"E1\" is displayed 211 190[Model phenomenon] Mitsubishi KFR-50LW/BPY inverter air conditioner, protection shutdown after power on, fault code \"P01\" is displayed 211 191. [Model phenomenon] Mitsubishi KFR-50LW/BPY inverter air conditioner, the protection stops after being turned on for more than ten minutes, and the fault code \"P2\", \"P9\" is displayed. 212 192. [Model phenomenon] Mitsubishi KFR-50LW/BPY inverter air conditioner, the outdoor unit stops after heating for dozens of minutes, and operates normally after a few minutes, and repeats this process. 212 193. [Model phenomenon] Mitsubishi KFR-50LW/FBPY inverter air conditioner, it keeps running at a low frequency after being turned on, and the cooling effect is poor. 212 194. [Model phenomenon] Mitsubishi KFR-60LW/MBPY inverter air conditioner, the indoor unit is turned on for a few minutes and the protection stops, and the fault code \"P1\" is displayed. 212 195. [Model phenomenon] Shinco KFR-32GWA/BP inverter air conditioner, the indoor unit operates normally when the cooling power is turned on, but the outdoor unit does not work, and the displayed fault code means \"communication abnormality\" 213 196[Model phenomenon] Xinke KFR-5001LW/BP inverter air conditioner, poor cooling effect 213 197[Model phenomenon] Xinke KFR-5001LW/BP inverter air conditioner, when heating, it stops shortly after being turned on, and restarts after a few minutes but stops again soon 213 198[Model phenomenon] Xinke KFR-60LW/BP inverter air conditioner, the indoor unit works normally, but the outdoor unit does not work 213 Appendix 215 Appendix A Fault Code Technical Data 215 1Aux KFR-45LW/TBP inverter air conditioner fault code 215 2Changhong KFR-25GW/BQ inverter air conditioner fault code 215 3Changhong KFR-25GW/RA (DBPF), KFR-35GW/RA (DBPF) wall-mounted inverter air conditioner indoor unit fault code 217 4. Changhong KFR-25GW/RA (DBPF), KFR-35GW/RA (DBPF) wall-mounted inverter air conditioner outdoor unit fault code 218 5. Changhong KFR-28GW/BP, KFR-28GW/BMF inverter air conditioner indoor unit fault code 219 6. Changhong KFR-28GW/BP, KFR-28GW/BMF inverter air conditioner outdoor unit fault code 219 7. Haier KFR-25GW/RA (DBPF), KFR-35GW/RA (DBPF) inverter air conditioner indoor unit fault code 220 8. Haier KFR-25GW/RA (DBPF), KFR-35GW/RA (DBPF) inverter air conditioner outdoor unit fault code 220·ⅩⅧ·9. Haier KFR-26 (35) GW/01FAC23 inverter air conditioner indoor unit fault code 221 10. Haier KFR-26 (35) GW/01FAC23 inverter air conditioner outdoor unit fault code 221 11. Haier KFR-26GW/(BP)5, KFR-35GW/(BP)5 split heat pump room air conditioner indoor unit fault code 222 12. Haier KFR-26GW/(BP)5, KFR-35GW/(BP)5 split heat pump room air conditioner outdoor unit fault code 223 13. Haier KFR-28 (35) GW/UA (DBPZF) DC inverter air conditioner indoor unit fault code 224 14. Haier KFR-28 (35) GW/UA (DBPZF) DC inverter air conditioner outdoor unit mainboard fault code 225 15. Haier KFR-28GW/K (BPF), KFR-35GW/K (BPF) inverter air conditioner fault code 225 16. Haier KFR-35/50GW/S (DBPF) inverter air conditioner indoor unit fault code 226 17. Haier KFR-35/50GW/S (DBPF) inverter air conditioner outdoor unit fault code 226 18. Haier KFR-35GW/V (DBPZXF/ZXF) DC inverter air conditioner fault code 227 19. Haier KFR-36GW/BPI inverter air conditioner fault code 22820. Fault code 227 for the indoor unit of the split-type air conditioner of Haier KFR-36GW/BPJF 21. Fault code 228 for the indoor unit of the inverter air conditioner of Haier KFR-40GW/DBPJF, KFR-40GW/A (DBPJF) 22. Fault code 229 for the indoor unit of the split-type air conditioner of Hisense KFR-26GW/27FZBP 23. Fault code 230 for the outdoor unit of the split-type air conditioner of Hisense KFR-26GW/27FZBP 24. Fault code 231 for the indoor unit of the inverter-type air conditioner of Hualing 50BP 25. Fault code 231 for the outdoor unit of the inverter-type air conditioner of Hualing 50BP 26. Fault code 232 for the split-type air conditioner of Kelon KFR-32GW/BP 27. Fault code 232 for the inverter-type air conditioner of Lehua 28AYB 28. Midea KFR-25 (32) GW/BP2Y full DC digital frequency conversion dual-rotor air conditioner indoor unit fault code 233 29. Midea KFR-25 (32) GW/BP2Y full DC digital frequency conversion dual-rotor air conditioner outdoor unit fault code 233 30. Midea KFR-26GW/BPY-R, KFR-35GW/BPY-R frequency conversion air conditioner fault code 234 31. Midea N series, W series DC frequency conversion wall-mounted air conditioner indoor unit fault code 234 32. Midea U series, V series full DC frequency conversion wall-mounted air conditioner indoor unit fault code 234 33. Midea U series, V series full DC frequency conversion wall-mounted air conditioner outdoor unit fault code 235 34. Midea Health Digital Star R1 frequency conversion wall-mounted air conditioner fault code 235 35. Midea Tianhuixing 50F2BPY AC frequency conversion cabinet air conditioner indoor unit fault code 236 36. Hitachi KFR-50LW/BPMT inverter cabinet air conditioner fault code 236 37. Senbao KFR-50GW/BP inverter cabinet air conditioner indoor unit fault code 236 38. Senbao KFR-50GW/BP inverter cabinet air conditioner outdoor unit fault code 236 39. Panasonic CS-G90KW, CS-120KW inverter air conditioner fault code 237 40. Shinco KFR-27GW/BM inverter air conditioner indoor unit fault code 237 Appendix B representative chip technical parameters 237 1. BR24C02F-W technical parameters 237 2. FSBB15CH60 technical parameters 238 3. HT82V733V technical parameters 239 4. M54532P technical parameters 240 5. MB89865 technical parameters 241 6. NCP1200P60 technical parameters 244 7. PS21867 Technical Parameters 244 8. STK621-041 Technical Parameters 245 9. TD62064AP Technical Parameters 246 10. TMP86PM46N Technical Parameters 247 11. TMP88CH47N Technical Parameters 248 12. μPA2003 Technical Parameters 250
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