Daikin VRVIII-S Service Manual page 136

SiENBE34-703
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Is power supply
220~240V provided?
YES
The float switch is
NO
connected to X8A (or
X15A) of the indoor unit
PC board.
YES
The float switch
contact is forming a
YES
short circuit
(continuity check
with X8A (or X15A)
disconnected)
NO
NO
Water builds up in
the drain pan.
YES
The drain pump is
NO
connected to X25A or
terminals Y1 and Y2 of
the indoor unit PC
board.
YES
The drain pump
YES
works when the
power supply is
reset for the indoor
unit.
NO
The voltage of
terminals Y1 and
NO
Y2 or X25A is
220~240 V (within
5minutes of
resetting the power
supply).
YES
Troubleshooting by Indication on the remote control
NO
A short circuit NO
connector is
connected to
X8A.
YES
Becomes normal when
NO
X8A (or X15A) of the
indoor unit PC board is
short circuited
YES
NO
The float switch
functions normally.
YES
Provide 220~240V power
supply.
Connect either a short circuit
connector or float switch and
turn on again.
Defect of indoor unit PC board.
Loose connection of connector.
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.
(V2778)
125