Over refrigerant protection
Measure if the exhaust temperature of
compressor Is normal
Use pressure gauge to measure if the pressure
is really high?
Check if the air inlet and outlet of the indoor
and outdoor exchanger is smooth?
Check if the indoor and outdoor fans run
normally?
Check if the capacity output of outdoor unit is
equal to the capacity demand of indoor units?
Check if the indoor electronic expansion valve
can work normally
Check if the refrigerant in the system is too
Normal?
The system pipe is blocked
Measure if the resistance of temperature
sensor is correct?
Measure if the pressure switch is normal？
Replace the corresponding exhaust
temperature sensor
Replace the mainboard of outdoor
unit
Replace the high pressure sensor
Replace the mainboard of outdoor
unit
Remove the obstructions
Measure the fan motor and signal
input
Refer to the dial-up of indoor and
outdoor unit
Engage the valve body with the coil
Add refrigerant according to the
nominal refrigerant volume
Focus on checking the inlet and outlet of the connection between indoor units and main pipe. Also
focus on checking the electronic expansion valve of indoor unit and outdoor unit. Replace the
electronic expansion valve, drying filter and other parts
NO
YES
YES
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
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