Gree GMV5 Series Service Manual page 173

GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
(4) Variable-frequency fan drive board IPM over-temperature fault (outdoor fault H8)
H8
Yes
Check if the fault occurs
Replace the fan's drive
after the system is
board.
power on.
No
Screw the IPM module
No properly and apply thermal
Check if the IPM module is
gel on its surface.
screwed properly and thermal gel
is applied on the surface.
Complete
(5) High voltage protection for the DC bus of the variable-frequency fan's drive board (ODU fault HH)
HH
Lower the voltage to
Yes
380 V.
Check if the voltage of the
whole system's input power
cable exceeds 460V
No
The fan's drive board is
faulty and needs to be
replaced.
Complete
170