Carrier xpower blue II 38KCL109313G - 9.2.5 IPM malfunction or IGBT over-strong current protection diagnosis and solution; 9.2.6 Over voltage or too low voltage protection diagnosis and solution

37
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.
Correct the connection.No
Yes
IPM continuity check. Check if the IPM
terminal resistance values are uniform.
Replace the module PCB.No
Check if the IPM installed correctly.
Yes
Correct the installation, tighten the
screws and apply silicon grease.
No
Check if the outdoor fan
can run properly.
Yes
No
Correct the connection of fan motor
or replace the fan motor.
Yes
Replace outdoor control PCB.
Does the problem still remain?
Replace the compressor.
Yes
9.2.6 Over voltage or too low voltage protection diagnosis and solution