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8.4.1.3 Zero-crossing signal detection error diagnosis and solution.
Malfunction decision
conditions
When 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
Trouble shooting:
Check if the connections and
power supply is 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.
PIC4:Checkpointbutton,press1timeforcheck
howmanyindoorunitsareconnected.
PIC3:MainboardLEDwhenpoweronand
unitstandby.
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