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Heating zones of
the same side
(Such as the first
and the second
zone) would
display "u".
Fan motor
sounds
abnormal.
28
The power board
and the display
board connected
failure;
The display board
of communicate
part is damaged.
The Main board is
damaged.
The fan motor is
damaged.
Check the connection.
Replace the display
board.
Replace the power
board.
Replace the fan.
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