42
Installation and Maintenance
Service Manual
4. Compressor overload, diacharge protectionmalfunction
Main checking points:
If there is refrigerant leakage;
If the eletric expansion valve is connected well or it is broken;
If the overload protector is broken;
Flow chart:
Eliminate the malfunction
End
Replace outdoor
mainboard
Start
If the overload protector is connected well?
Check the resistance between the two
ends of the overload protector in ambient temperature,
if the resistance is below 1k
If the wiring of the eletric expansion valve
is coonected well?
Replace the
overload
protector
Check the coil of the eletric
expansion valve, replace
it if it is broken
Eliminate the malfunction
Reconnect according
to the wiring diagram
Check the refrigerant status, if there is
refrigerant leakage, recharge it according
to the service manual
Note: the detection method of the coil of the eletric expansion valve: there is five pieces of coil of the eletric expansion valve,
the resistance of one of them (the leftmost or the rightmost one) is almost the same as the resistance of other terminal (within
100
). Judge the condition of the electronic expansion valve through detecting these resistance.
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
