SG-40MAHB-01: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
30
DIAGNOSIS AND SOLUTION (CONT)
Over voltage or too low voltage protection diagnosis and solution (P1)
Malfunction Decision Conditions
An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.
Possible Causes:
• Power supply problems
• System leak or blockage
• PCB faulty
Troubleshooting
Fig. 33 — 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 outdoor main PCB.
