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