Gree GWH12MB-K3DNE3G Service Manual page 45

5. Malfunction of Zero-crossing Inspection Circuit Malfunction of the IDU Fan Motor U8
42
Troubleshooting
for U8 malfunction
Re-energize1
minute after
de-erergization
U8 is still
displayed
Yes
The zero-cross detection
circuit of the mainboard is
defined abnormal.Replace
the mainboard with the same
model
End
The unit returns to normal.
Conclusion:U8 is displayed due
No
to instant energization afte de-
energization while the capacitor
discharges slowly.
Service Manual
Installation and Maintenance