GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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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
compressor from the drive board two minutes after the system is powered off. Make sure that it is tested
at least 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.
(4) Variable-frequency compressor drive board IPM over-temperature fault (ODU fault P8)
Check if the fault
occurs when the
system is powered on.
Check if the IPM module is
screwed well and thermal gel
is applied on the surface.
Replace the
compressor's drive
board.
Screw the IPM module
properly and apply
thermal gel on the
surface.
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