Carrier DHMVHA Service Manual page 32

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DIAGNOSIS AND SOLUTION (CONT.)
Over voltage or Too Low Voltage Protection (PC01)
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
Check the power supply.
Check the connections and wires.
Check the voltage between P and N.
Check the reactor.
Replace the reactor.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
PC01
An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.
Power supply functions
System leakage or block
PCB faulty
Yes
Yes
Yes
Yes
Fig. 30 — Test
Stop the unit.
No
Correct the connections or
No
replace the wires.
No
Replace the IPM board.
No Replace the outdoor main PCB.
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