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8.4.1.3 Zero-crossing signal detection error diagnosis and solution.
Malfunction conditions
Potential causes
Trouble shooting:
Check if the connections and
power supply is normal ?
Yes
Indoor main PCB is
defective. Replace indoor
main PCB.
When PCB does not receive zero crossing signal feedback for
4 minutes or the zero crossing signal time interval is abnormal.
● Connection mistake
● Faulty PCB
Correct the connections . Turn on the
No
unit when the power supply is good .
48
PIC 4: Check point button, press 1 time for check
how many indoor units are connected.
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