44
Troubleshooting
9.2.4 U8 malfunction
“U8” is
displayed on
the unit
.
Re-energize1
minute after
de-erergization
Is“U8” still
displayed ?
The zero-cross detection
circuit of the mainboard is
defined abnormal. Replace
the mainboard.
Malfunction is
eliminated.
The unit returns to normal.
Conclusion: U8 is displayed due
to instant energization afte de-
energization while the capaci-
tor discharges slowly.
No
Yes
Possible causes; 1.The controller diagnoses incorrectly due to instant energization after de-energized while
the capacitor discharges slowly; 2.Malfunction of the zero-cross detection circuit of the mainboard. See the
flow chart below:
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