Service manual

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(V2778)
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Caution
Replace float switch.
Modify the float switch's
connection and turn on again.
Connect the drain pump and
turn on again.
Check the drain piping for
clogging or upward slope, etc.
Replace indoor unit PC board.
Replace the drain pump or
check for dirt, etc.
Connect either a short circuit
connector or float switch and
turn on again.
Defect of indoor unit PC board.
Loose connection of connector.
Provide 220~240V power
supply.
Is power supply
220~240V provided?
The float switch is
connected toX8A
of the indoor unit
PC board.
A short circuit
connector is
connected
toX8A.
The float switch
contact is forming a
short circuit
(continuity check with
X8A or X15A
disconnected)
Becomes normal
when X8A of the
indoor unit PC board
is short circuited
The float switch
functions normally.
Water builds up
in the drain pan.
The drain pump is
connected to X25A or
terminals Y1 and Y2 of
the indoorunit PC
board.
The drain pump
works when the
power supply is
reset for the indoor
unit.
The voltage of
terminals Y1 and Y2
or X25A is 220~240 V
(within 5minutes of
resetting the power
supply).
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES