GMV5 DC INVERTER VRF UNITS 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
① 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.
② 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.
③ 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.
Replace the fan's drive board
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.
The fan is faulty and
needs to be replaced.
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