Some
buttons
can’t
work
Is
the
button
not
recognized
at
all?
No
Is
the
button
recognized
intermittently?
Yes
Yes
No
Is
the
button
not
recognized
after
cleaning
the
control
panel?
No
Yes
Push
“ON/OFF”
button
to
restart
unit,
does
the
symptom
continue?
Yes
The
display
board
is
defective.
Replace
the
display
board.
Replace
the
display
board.
Perform
the
operation
again
and
check
if
it
is
working
properly.
No
- 22 -
4-3 Electrical Malfunction
