Daikin VRV III REYQ8PY1, Service Manual

Page: 244 / 452

Si37-701 Troubleshooting by Indication on the Remote Controller
Troubleshooting 233
Troubleshooting
(V2778)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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.
YES
YES YES
YES
YES
Defect of indoor unit PC board.
Loose connection of connector.
NO NO
NO
YES
YES
NO
NO
YES
NO
YES
NO
NO
The float
switch is connected to
X8A of the indoor unit
PC board.
NO
The drain
pump works when
the power supply is reset
for the indoor
unit.
The drain
pump is connected
to X25A or terminals Y1
and Y2 of the
indoorunit PC
board.
The voltage
of terminals Y1
and Y2 or X25A is
220~240 V (within
5minutes of resetting
the power
supply).
Water builds up
in the drain pan.
The float
switch contact is
forming a short circuit
(continuity check
with X8A or X15A
disconnected)
A short
circuit connector is
connected to
X8A.
Provide 220~240V power
supply.
YES
NO
Is power supply
220~240V provided?
Becomes
normal when X8A of
the indoor unit PC board
is short circuited
The float switch
functions normally.