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Heat Controller, Inc. VMH SerieS Service Manual
9.3.2.11 High PFC module protection (ODU P6) (Only for A-VMH36QC-1)
9.3.2.12 Inverter compressor drive protection (ODU P7)
The trouble shooting is same process as the IPM module protection, trouble shooting.
Refer to this section.
PFC module protecton
Replace the outdoor main board
Replace the inductance
Replace the PFC module
Check whether the voltage range
of P-N on IPM module is normal?
DC277-356V for 18-27KBtu/h;
DC277-410V for 36KBtu/h
Check whether the inductance
of PFC module is good? If the
inductance is good, the resistance of
the two ports is 0
Check whether the connecting line
between main board and the PFC
module is connected tightly
Connect it tightly,
check normal or not
No
Yes
No
Yes
Yes
No
No