In the use of inverter air conditioner in the course of the inevitable failure, when a problem occurs, to timely maintenance, the following are several common maintenance techniques.

Fault phenomenon and judgment

(1) plug in the power plug, indoor unit power indicator light, such as no power indicator, indicating your home power failure or instructions such as damage.

(2) there is a power indicator, with the remote control by pressing the operation key, the signal is not emitted. First, check the battery inside the remote control whether there is electricity, and then check the battery positive and negative pole contact with or without oxidation, if the above normal, check the remote control of the internal circuit board is damaged, the remote control can be close to an AM radio, Press the remote control key to interfere with the test, listen to the radio is issued a "beep" sound, said the remote control no trouble.

(3) When the remote control to determine the trouble-free, the signal or launch is not out, the indoor unit can be forced to run the switch verification, forced operation, indoor flow fan and outdoor compressor if the normal operation, cooling effect is good, Indoor unit infrared receiver parts are faulty.

(4) When you use the remote control to install a new battery is not displayed for less than a month, you can open the remote control cover, with 95% alcohol cleaning circuit board and key contact surface conductive film, dry After the leakage can be ruled out, remote control LCD display missing words can also use this method.

(5) The temperature sensor in the inverter air conditioner plays a very important role. The indoor unit has air temperature sensor and evaporator temperature sensor. The outdoor unit has air temperature sensor, high pressure pipeline sensor and low pressure pipeline sensor. Some sensors are in (Such as indoor unit air temperature sensor resistance becomes larger, will cause the inverter output frequency is low), in order to ensure the control accuracy, and its same operating characteristics, to determine the sensor After the failure, should use the original model of the product.

(6) in the air conditioner failure, if the identification of the entire control system is faulty, the indoor unit controller switch on the "test run" block, then the microprocessor will send a frequency to the inverter 50Hz signal, if the air conditioner can run at this time, and keep the frequency of the same work, generally believed that the entire control system without major problems, can focus on checking the sensor is intact. If the air conditioner does not operate normally, it indicates that the control system is faulty.

2 control system detection method

(1) communication circuit

In the detection of communication failure, with a multimeter AC voltage file 250V test, in the zero line and the signal line if the voltage changes back and forth and the indoor unit communication instructions and other flashing, then the communication is normal, otherwise the communication circuit is faulty.

(2) power module

In the event of a power module failure, the first method is to measure the power module with a multimeter diode gauge. The "+" pole is connected to the U, V, W pole, or U, V, W pole and "-" For the 380-450Ω, and reverse non-conduction, otherwise the power module is faulty; the second method is to use a multimeter AC voltage file, measuring the power module to drive the compressor voltage, the voltage between any two should be 0 ~ 160V Between and equal, otherwise the power module is damaged.

(3) Reactor

In the detection of reactor, with a multimeter R X1 file to measure the winding resistance of about 1Ω.

(4) Compressor

In the detection of the compressor, with the pliers first U, V, W wire, measured between the three-phase voltage, if the three-phase voltage is the same, indicating that the compressor winding is good, otherwise the compressor winding fault.

(5) electrolytic capacitors

In the inverter air conditioner has a large capacity electrolytic capacitor, the maximum is 2000-4500uF, even if the power supply will still have residual charge, so the electrolytic capacitor first with a soldering iron, plug and other objects to fully release the residual charge. After the charge is released, use the pointer multimeter RX10K file detection, the pointer should refer to 0, and then slowly back to ∞, otherwise the electrolytic capacitor is damaged.

(6) sensors

If the frequency of air conditioners can not lift and protect the shutdown and other failures, should first consider checking the sensor, most of the sensor can be removed from the outlet, from the appearance that can determine whether damage, fracture, degumming. Heated by hand or warm water, with a multimeter RX100 file to measure its resistance, to see whether its resistance changes, no change can determine the sensor damage.