SG-40MAHB-01: Service Manual
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20
DIAGNOSIS AND SOLUTION (CONT)
Zero crossing detection error diagnosis and solution (E2)
Malfunction Decision Conditions
When the PCB does not receive a zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal.
Possible Causes:
• Connection error
• PCB faulty
Troubleshooting
Check if the connections and
the power supply are normal.
Correct the connections. Turn on the
unit when the power supply is good.
No
Yes
Indoor main PCB is
defective. Replace the
indoor main PCB.
