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38MGRBQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
E5/ PC 10/PC 11/PC 12 (Over-voltage or under-voltage protection) diagnosis and solution
ERROR CODE
MALFUNCTION DECISION
CONDITIONS
SUPPOSED CAUSES
Troubleshooting
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
E5/ PC 10/PC 11/PC 12
An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.
Wiring mistake
Faulty Sensor
PCB faulty
Voltage protection
Check the outdoor unit's power
supply voltage. Is the voltage between
L (L1) and N (L2) (about 187~264VAC).
Yes
Check whether the voltage of IPM
board P and N(GND) is normal?
DC277—356V for 2-zone(18K Btu/h)/3
zone(27K Btu/h)
DC277-410V For 4-zone(36K Btu/h)/5-
zone(48K Btu/h)
No
Replace bridge rectifiers,
and then check whether the
(for
system can run normally
5-zone)
No
Replace IPM board, and
then check whether the
system can run normally
No
Replace outdoor main board
No
Check the power supply
Yes
Yes
Yes
Problem solved
52
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