Carrier 40MPHA - Page 31

31
DIAGNOSIS AND SOLUTION (CONT)
P4 (Inverter compressor drive error diagnosis and solution)
Description: If the temperature of IPM module is higher than limited value, the LED displays this failure code.
Recommended parts to prepare:
S Wiring mistake
S PM malfunction
S Outdoor fan assembly faulty
S Compressor malfunction
S Outdoor PCB faulty
Troubleshooting and Repair:
Check the wiring between the
PCB and compressor
Is it improperly wired ?
Ensure proper connections or replace
the wires and connectors
YES
Check the IPM
NO
Is it functioning
properly?
Replace the IPM board or
replace the outdoor PCB
NO
Check the outdoor fan and
the outdoor unit ventilation
YES
Is it functioning
properly?
Please refer to “Fan
Speed Malfunction”
NO
Check the compressor
resistance values.
YES
Are they within
acceptable parameters ?
Replace the compressorNO
Replace the outdoor PCB
YES