31
Installation and Maintenance
Service Manual
(4) U8 malfunction
M alfunction is
eliminated.
No
Yes
“U8” is
displayed on
the unit.
Re-energize 1
minute after
de-erergization
Is“U8”
still displayed?
The zero-cross detection
circuit of the mainboard is
defined abnormal. Replace
the mainboard.
The unit returns to normal.
Conclusion: U8 is displayed due to
instant energization after de-
energization while the capacitor
discharges slowly.
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