Troubleshooting Guide

1.3.3 Zero crossing detection error diagnosis and solution (E2)
Error Code
E2
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.