38MGRBQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
37
DIAGNOSIS AND SOLUTION (CONT)
Zero-crossing signal detection error diagnosis and solution
Troubleshooting
ERROR CODE
EC / PC 40
MALFUNCTION DECISION
CONDITIONS
When the PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time
interval is abnormal.
SUPPOSED CAUSES
Connection mistake
PCB faulty
Are the connections and
power supply normal?
Correct the connections. Turn on the
unit when the power supply is good.
No
Yes
Indoor main PCB is
defective. Replace indoor
main PCB.
.
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