Over/Too Low Voltage Protection Diagnosis And Solution; Test - Carrier 38MHRB series Service Manual

DIAGNOSIS AND SOLUTION (CONT)
Over voltage or too low voltage protection diagnosis and solution (P1)
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
Check the power supply
Check the connections and
wires
Check the voltage between P
Check the reactor
Replace the reactor
NOTE: Measure the DC voltage between the P and N port. The normal value should be around 310V.
P1
An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.
S
Power supply problems
S
System leakage or block
S
PCB faulty
Yes
Yes
and N
Yes
Yes
Fig. 42 – Test
Stop the unit
No
Correct the connections or
No
replace the wires.
No
Replace the IPM board
Replace outdoor main PCB
No
40