Gree GMV-120WM/B-F

GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
196
5) High voltage protection for the DC bus of the variable-frequency fan's drive board (ODU fault HH)
6) Low voltage protection for the DC bus of the variable-frequency fan's drive board (ODU fault HL)
Yes
No
HH
Check if the voltage of the
whole system's input power
cable exceeds 410V
Complete
Lower the voltage to
380 V.
The fan's drive board is
faulty and needs to be
replaced.
No
Yes
No
Yes
The fan's drive board is
faulty and needs to be
replaced.
Check if the
terminal CN503
and CN504 on the
fan's drive board
are connected.
HL
Check if the voltage of
the input power cable is
lower than 205V
Complete
Elevate the voltage
to 380V.
Check if the terminal CN503
and CN504 on the fan's
drive board are connected.