Heat Controller VMH09SC-1 Service Manual page 39

Heat Controller, Inc.
E5 & E6
9.2.5 Open or short circuit of temperature sensor diagnosis and solution
Check the connections between
the sensors and the PCB. Are the
connections good?
Yes
Replace the sensor and check if
E5 or E6 displays again?
P0:
9.2.6 IGBT over current protection diagnosis and solution
Check whether the connections between
outdoor PCB and IPM are good?
Yes
Check whether the IPM is fixed to radiator
tightly
Replace the IPM
VMH SerieS
Yes
No
The unit does not work normally
38
39
Replace the outdoor or
Replace the outdoor or
indoor PCB
indoor PCB
Fastening the IPM to the radiator
Replace the compressor
Service Manual