37
Heat Controller
VMH 30, 36 SerieS
Service Manual
35
9.2.5 IGBT over-strong current protection diagnosis and solution.
9.2.6 Excessive voltage or voltage too low protection diagnosis and solution.
Is the power supply good?
Replace the outdoor electrical box.
Make sure the power supply is normal.
Yes
No
Yes
Fastening the IPM to the radiator
No
Check whether the connections between
outdoor PCB and IPM are good?
Check whether the IPM is fixed to radiator
tightly
Replace the IPM
The unit does not work normally
Replace the compressor
Replace the compressor
Yes
