44 Specifications subject to change without notice. SG-38MHRC-01
DIAGNOSIS AND SOLUTION (CONT)
Over voltage or too low voltage protection diagnosis and solution (P1)
Description: An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.
Possible causes:
• Power supply problems
• System leak or block
• Faulty PCB
Troubleshooting
Fig. 48 — Test
NOTE: Measure the DC voltage between the P and N port. The normal value should be around 310V.
Check the power supply.
Check the connections and wires.
Stop the unit.
No
Yes
No
Correct the connections or
replace the wires.
Yes
Replace the reactor.
Yes
No
Replace the IPM board.
Check the voltage between P and N.
Check the reactor.
Yes
No
Replace the outdoor main PCB.
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