Cause of the failure of inverter air conditioner can be roughly divided into two types of 021 -56,102,546 First, the external causes or human error (especially user power is not normal, the voltage is high or low), the second is the failure of the machine itself (sub-cooling and electrical system failure). Failure for the machine itself, rule out a cooling system failure, to determine whether the system is leak fluorine, the pipe is clogged, the condenser cooling efficiency, etc., followed by check whether the power, or other electronic control, such as the motor winding is exception, the relay whether poor contact and power module breakdown. 

 The power not to receive remote control signals failure, it is easy to determine the electrical system failure, without refrigeration or cooling effect difference is easy to determine the cooling system failure. However, some failures are more difficult to distinguish, by measuring the voltage, current, pressure, temperature difference. 

 (1) air conditioning is not running to failure. The failure to distinguish by measuring the equilibrium pressure of the refrigeration system, such as the equilibrium pressure above 0.3MPa, indicating a fault in the electrical system; such as the equilibrium pressure is too low, indicating failure in the refrigeration system. 

 (2) air conditioning to start the frequent failure. Compressor running current judgment this failure by measuring the power state, such as the normal operation of the compressor current instructions so the sim in the refrigeration system; such as the operating current is too large or too small, indicating that the fault in the electrical system. 

 (3) air-conditioning difficulty in starting failure. For this failure can be determined by measuring the system pressure and the starting current, such as the normal system equilibrium pressure compressor starting current is too large, indicating failure in the electrical system, but may also be in the refrigeration system. Maintenance, such as refrigerant let go, start the compressor can start, indicating a fault in the refrigeration system (compressor stuck exceptions); such as the boot does not start, the fault in the electrical part can replace the pressure 
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