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DIAGNOSIS AND SOLUTION (CONT)
Table 19—IPM Malfunction or IGBT Over−strong Current Protection Diagnosis and Solution (PO)
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
Check the wiring between main PCB
and compressor. Is there an error?
Check the IPM. Is it in working
Check the outdoor fan and the
outdoor unit ventilation. Is it in
working order?
Check the compressor resistance
values. Are they within acceptable
Replace the outdoor main PCB
NOTE: In figures 20−23 the following is observed:
S
U,V,W references the compressor connection point
S
P references input voltage
S
N references output voltage
PO
When the voltage signal that IPM sends to the compressor drive chip is abnormal, the LED
displays "PO" and the AC turns off.
S
Wiring mistake
S
IPM malfunction
S
Outdoor fan assembly faulty
S
Compressor malfunction
S
Outdoor PCB faulty
No
order?
Yes
Yes
parameters?
Yes
Ensure a proper connection or
Yes
replace the wires and connectors
Replace the IPM board or replace
No
the main PCB
Please refer to the solution
No
"fan speed is out of control
malfunction
No
Replace the compressor
29
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