Gree GMV-120WM/B-F

GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
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3) Variable-frequency fan over-current protection and IPM module protection faults (ODU fault H5
and H6)
Attachment: How to check whether the IPM module is damaged
a. Preparation: Find a digital multi-meter and switch it to the diode. Remove U, V and W cables of
the fan from the drive board two minutes after the system is powered off. Make sure that it is tested two
minutes after the system is powered off.
b. Method: Use the black probe of the multi-meter to touch the place marked by P in the follow
picture and the red probe to touch places marked by U, V and W respectively and record readings of the
multi-meter. Use the red probe to touch the place marked by N and black probe to touch places marked
by U, V and W respectively and record readings of the multi-meter.
c. Analyzing: If the reading ranges between 0.3 V and 0.7 V in the above-mentioned six scenarios,
the IPM module is normal. If the reading is 0 in one or multiple scenarios, the IPM module is damaged.
No
Yes
Yes
No
Replace the fan's drive
board
Reconnect it properly.
H5 or H6
Check if the IPM module is
damaged according to the
method mentioned in
Attachment 4.3.
Check if the fan's
UVW cable is
connected properly.
Replace the fan's
drive board to see if
the fault is solved.
Complete
No
The fan is faulty and
needs to be
replaced.