空調(diào)器控制器電路故障檢修思路（Troubleshooting method for controller circuit of air conditioner）

1、空調(diào)器控制器電路故障檢修思路（Troubleshooting method for controller circuit of air conditioner）First power, after load, first strong current, weak current,First indoors, then outdoors, first at both ends, then in the center,If the circuit can be separated from the outdoor circuit, the main circuit and the control

2、circuit, it will make the circuit troubleshooting simple and concrete.How to judge indoor and outdoor circuit fault:1, the air conditioner has input and output signal line, can be used to judge the short circuit method. Such as the method of air conditioner can return to normal, the fault in the out

3、door machine; if not eliminate the fault, the fault in the indoor machine.2, the outdoor terminal wiring measurement has no AC voltage or DC voltage to determine the fault position. If the AC or DC voltage measurement outside the terminal, the fault in the outdoor machine; such as measurement of AC

4、or DC voltage and the fault in the indoor circuit.3, the larger power of the cabinet air conditioner can observe the outdoor contactor whether to pull in to determine the fault location, such as contactor pull in, indicating that the fault in the outdoor machine; if there is no pull, that the fault

5、in the indoor machine4. For faulty display air conditioners, fault location can be identified by observing indoor and outdoor failure codes5, for the use of serial communication circuit of the air conditioner, oscilloscope can be used to measure the waveform of the signal line to determine the locat

6、ion of the fault6, for the heat pump type air conditioner is not defrost or defrost frequently, mostly for outdoor main control circuit board fault7, conditions can also be replaced by changing the circuit board to distinguish the outdoor machine faultHow to judge the fault of control and main circu

7、it:1, for the compressor frequent switch fault, judge fault location by measuring the air conditioning load current and voltage. Such as compressor compressor current is too large, the fault in the main circuit; if the compressor current is normal, the fault in the control circuit2, for the fault of

8、 fan compressor does not start by observing the outdoor AC contactor is attracted to determine the fault location. Such as the contactor and the compressor does not work, the fault in the main circuit; if the contactor does not pull the fault in the control circuit. For the inverter air conditioner,

9、 the press does not start, and the power module can be used to eliminate the trouble1. Measure whether the indoor and outdoor protective components are normal, to determine the fault area, such as measuring the normal protection components, indicating the fault in the control circuit, such as measur

10、ing the damage of protective elements, indicating the failure in the main circuit2, for the fault of the compressor does not run, can be pressed forcibly contactor, observe whether the normal refrigeration compressor. The compressor can press the contactor running and cooling, the fault in the contr

11、ol circuit; such as compressor over-current or press the contactor does not start, the fault in the main circuit. (inverter compressor can not use this method)3, for compressor frequently start fault, such as touch the compressor shell temperature is too high, mostly for the circuit or compressor it

12、self failure4, for variable frequency air conditioning, you can through the air conditioner fault indicator to judge, such as EEPROM, power module, communication failureHow to judge the fault of protection and main control circuit:1. The location of the fault can be determined by detecting the indoo

13、r and outdoor thermal resistance, pressure relay, thermal protector and phase sequence protector. If the protection element is normal, the fault is shown in the main circuit; if not normal, the fault is shown in the protective circuit.2, the use of replacement method to distinguish fault points, suc

14、h as the new master board replaced the old motherboard, the failure to eliminate the phenomenon, indicating that the fault in the main control circuit; such as replacement, the fault still exists, indicating that the fault in the protection circuit.3, the use of air conditioner "emergency switc

15、h" or "forced switch" to distinguish fault points, such as the emergency switch after the air conditioner capable of cooling or heating, the main control circuit that normal fault in the remote control transmitter and protection circuit; such as the mandatory switch, air conditioning

16、is not running, the fault in the main control circuit4, observe the air conditioner protection indicator light is bright or not to distinguish fault points, such as protection light is bright, indicating fault in the protection circuit, such as protection lamp is not bright, indicating fault in the

17、main control circuit5, for no power supply does not show fault, first check the power transformer, varistor, safety tube is normal, such as the above components are normal, indicating that the fault in the main control circuit board6, measuring the main board DC 12V and 5V voltage is normal, and the

18、 air conditioner has no power supply display, also does not receive remote control signal, mostly control circuit fault. Except for the remote control and remote control receiver.How to analyze and judge the fault of main control circuit:The main control circuit board fault of air conditioner often

19、has the following forms of expression, and can be analyzed according to the fault phenomenon in the overhaul.The principle and maintenance of the main circuit board refer to the sixth chapter of Hisense inverter air conditioner principle and maintenance.1, no power supply display, the whole machine

20、does not work. This fault refers to the power transformer, safety tube, varistor and power supply voltage normal, the air conditioner does not receive remote control signal, no power source display, and the whole machine does not work. There are several situations:Main control circuit board, DC regu

21、lated power supply, fault.Fault of reset circuit of main control circuit board.Main control circuit board, three minutes delay circuit fault.The main control circuit board passes through the zero detection circuit fault.Main control circuit board, crystal oscillator circuit fault.The remote control

22、switch circuit fault.The indoor or outdoor MCU own fault.2, the power supply shows normal, but the whole machine does not work. This fault refers to the air conditioner power supply shows normal and can receive remote control signal, but the fan motor and compressor can not work properly, the cause

23、of this fault is as follows:Driving circuit fault of main control board of air conditioner.Power supply over-voltage fault protection circuit fault.Three-phase power supply phase sequence protection circuit fault.Reset circuit fault of main control circuit board.The power module is not normal.DC 12V

24、 is not normal.Communication circuit fault of indoor and outdoor control board.Indoor or outdoor single chip microcomputer malfunction.3, the power supply is normal, but the compressor is open and stopped frequently. This fault refers to the indoor does not reach the set temperature, compressor oper

25、ation for a period of time automatically stop, and automatically start the phenomenonThe reasons for the failure are as follows:Indoor main board temperature detection circuit faultFailure of drive circuit for indoor or outdoor compressorThe temperature detecting circuit of the outdoor main board is

26、 out of orderIndoor and outdoor single chip microcomputer malfunction4. The compressor will stop automatically after running for some time. This failure means that the compressor can stop after running for some time. If it does not start, there is a fault, that is, the room has not reached the set t

27、emperature.Driving circuit fault of indoor or outdoor main board.Indoor or outdoor main control panel overcurrent detection circuit fault.Indoor or outdoor main board, high and low voltage protection circuit fault.Indoor or outdoor main board temperature detection circuit faultIndoor or outdoor sing

28、le chip microcomputer malfunctionIndoor or outdoor EEPROM self fault5, compressor running, but the indoor fan does not turn. This fault refers to the normal operation of the outdoor unit, but the indoor fan does not turn, or the first boot, the fan running, but after a period of time automatically s

29、topIndoor or outdoor main board temperature detection circuit fault.Indoor or outdoor main board fan drive circuit fault.Indoor or outdoor main board communication circuit fault.Indoor or outdoor main board wind speed detecting circuit faultIndoor or outdoor single chip microcomputer malfunction6 、

30、the heat is normal, but not defrost or defrost frequently. This fault refers to the normal heating of the air conditioner, but the outdoor radiator defrost effect is not good or not defrost, and the outdoor radiator of air conditioner does not have frost, but there is periodic defrosting phenomenon:

31、Outdoor defrosting, circuit board, circuit fault.Outdoor main board temperature detection circuit fault.Indoor pipe temperature detection, detection, protection circuit fault.Communication circuit fault of indoor and outdoor main board.Outdoor tube temperature thermistor open circuit fault.Outdoor f

32、an motor drive circuit fault.7, the air conditioner can refrigeration, but not thermal failure. This fault refers to the normal operation of refrigeration, but when the heating machine does not work outside or outside the valve, the coil is not connected, electrical failure, the main reason for this

33、 failure is as follows:Indoor main board temperature detection circuit fault.Indoor or outdoor main board communication circuit fault.Outdoor main board, reversing valve, coil drive circuit fault.Defrosting temperature detection circuit fault.Indoor or outdoor single chip microcomputer malfunction.8

34、, air conditioning dehumidifier normal operation, in the refrigeration state, the compressor does not turn, there are the following reasons:Internal control board ring temperature detection circuit fault.Single chip microcomputer self faultIndoor and outdoor main board protection circuit fault9, the

35、 air conditioner suddenly crashes. When this fault occurs, the air conditioner is not controlled by its own switch or remote controller, but only when the power plug is pulled off, and the air conditioner is running normally after the next switch on. Common causes of failure are as follows:Anti-inte

36、rference circuit fault.The signal driving circuit of outdoor main board is out of order.Indoor or outdoor reset circuit design is unreasonable.Measuring static resistance of components of electric control board by multimeter.Troubleshooting for common troubles of air conditioner* compressor can not

37、stop for long timeCause of trouble 1Inadequate refrigerant dose, refrigerant all or part of the leakageRemoval methodFind out the leak site, trap, the refrigeration system to vacuum, add refrigerant, by professional maintenance personnelCause of trouble 2Filter cloggingRemoval methodReplace filters,

38、 refrigeration systems, re vacuum, add refrigerant, etc., should be maintained by professionals* compressor cannot runCause of trouble 1Power failureRemoval methodWith a multimeter, then check the troubleshooting pencil. If the fuse breaks, the fuse will be replaced, and the wires will be replaced w

39、hen the wires are brokenCause of trouble 2The supply voltage is too lowRemoval methodMeasure the voltage with a multimeter, and use the voltage regulator when necessaryCause of trouble 3Loose or broken electrical connectionsRemoval methodCheck the wiring parts, loose connector should be re inserted,

40、 inserted, should be professional maintenance* fan does not runCause of trouble 1The main switch is out of contactRemoval methodMeasure the contact resistance of main control switch with multimeter. If the resistance is too great or zero, repair or replace should be doneCause of trouble 2Fan motor coil damageRemoval methodCheck with the multimeter to replace fan motors with the same specifications and speedCause of trouble 3Between the fan motor and the blade, the screws are loosenedRemoval methodZhu Di? For reasons of fault BR> 4 boat?Fan