Daikin R410As Service Manual page 170

Si39-302
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
NO
switch is connected to
X8A of the indoor unit
PC board.
YES
The float
switch contact is
forming a short circuit
YES
(continuity check
with X8A or X15A
disconnected)
NO
NO
Water builds up
in the drain pan.
YES
The drain
pump is connected
NO
to X25A or terminals Y1
and Y2 of the
indoorunit PC
board.
YES
The drain
YES
pump works when
the power supply is reset
for the indoor
unit.
NO
The voltage
of terminals Y1
and Y2 or X25A is
NO
220~240 V (within
5minutes of resetting
the power
supply).
YES
Troubleshooting by Indication on the Remote Controller
NO
A short
NO
circuit connector is
connected to
X8A.
Becomes
NO
normal when X8A 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)
159