Gree GMV6 DC Inverter VRF Units Service Manual
2.85 "H8" IPM Over Temperature Protection for Fan Drive
Fault display: main board of outdoor unit displays
Fault diagnosis:
If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is H8, it
indicates the IPM over temperature protection for the fan drive.
Possible causes:
■ The IPM module is not covered, or unevenly covered by thermal grease, or covered by dried
thermal grease;
■ The IPM module's screws are not tightened;
■ The fan drive board operates improperly.
Troubleshooting:
"H8" Temperature
Sensor Fault of Fan
Drive
Whether the drive board
screws are tightened? Whether
the IPM module is coated with
thermal grease?
Whether over-temperature
protection of IPM module is
triggered upon power-on?
The fan drive board
is abnormal
Replace the fan
drive board
No
Yes
Tighten the screws and
coat the cooling plate with
thermal grease
Yes
Yes
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