Carrier xpower blue II 42KCL109313G Service Manual page 39

9.2.5 IPM malfunction or IGBT over-strong current protection diagnosis and solution
Check if the wiring between
module PCB and compressor
connected correctly.
Yes
IPM continuity check. Check if the IPM
terminal resistance values are uniform.
Yes
Check if the IPM installed correctly.
Yes
Check if the outdoor fan
can run properly.
Yes
Replace outdoor control PCB.
Does the problem still remain?
Yes
Replace the compressor.
9.2.6 Over voltage or too low voltage protection diagnosis and solution
No Correct the connection.
No Replace the module PCB.
Correct the installation, tighten the
No
screws and apply silicon grease.
Correct the connection of fan motor
No
or replace the fan motor.
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