Overload Protection Compressor H3; Malfunction Diagnosis Process - Gree GWH12QB-K3DNA6O Service Manual

Service Manual

8. Overload Protection Compressor H3

Main detection points:
● Heat exchange of unit is not good? (heat exchanger is dirty and unit radiating environment is bad)
● Fan motor is not working?
● Too much load of the system causes high temperature of compressor after working for a long time?
● Whether high pressure switch is normal?
● If the refrigerant is leaked?

Malfunction diagnosis process:

Outdoor and indoor heat
exchangers are too dirty or the air
inlet/outlet is blocked.
Fan motor is not working.
Abnormal fan speed; fan speed is too
low or the fan doesnt run.
Compressor doesnt work
normally. Strange noise or leakage occurs.
Temperature of the shell is too high.
System is blocked inside
(dirt block, ice block, oil block, Y-valve not
Check whether high
pressure switch is normal
Check whether the
refrigerant is leaking and cause
overheating protection to compressor
Replace a main
Installation and Maintenance
Start
Yes
No
No
No
fully open).
No
No
No
board of the
same model.
End
Clean the outdoor and indoor heat exchangers
and remove blockage of air inlet/outlet.
No
Yes
Check motor and re-install the motor to
make it run normally.
No
Yes
Make compressor run normally.
No
Yes
Remove blockage in the system.
No
Yes
Replace high pressure switch
No
Yes
Check the leaking status of refrigerant
and charge refrigerant
No
Yes
Malfunction is
eliminated.
Malfunction is Yes
eliminated.
Yes
Malfunction is
eliminated.
Malfunction is Yes
eliminated.
Malfunction is Yes
eliminated.
Malfunction is
Yes
eliminated.
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