Carrier 40MFC - Abnormal High Voltage or Abnormal Low Voltage Protection Diagnosis and Solution (P1)

27
7 --- Abnormal high voltage or abnormal low voltage protection --- diagnosis and solution (P1)
Error Code P1
Malfunction conditions An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.
Possible Causes
• Power supply problems
• System leakage or block
•PCBfaulty
Trouble shooting:
Check if the power supply is
normal.
Check if all the connections
and wires are good?
Disconnect the unit with power
supply and try to restart the unit
when power supply is good.
No
Yes
No
Correct the connections or replace
the wires.
Yes
Power on and when the unit is in
standby, check if the voltage
between P and N is around DC
310V or 340V or 380V? For different
kinds of units, the voltage differs.
Consult with technical engineer to
get definite value. Then start up the
unit, measure the voltage between
P and N. Is it in 220V~400V?
Replace outdoor main PCB.
Yes
No
Replace the IPM board if it is separate
with main PCB.
A14487
Note:
Measure the DC voltage between the P and N ports. The normal value should be around 310V.