Daikin RTSQ20PY1 Service Manual page 234

Troubleshooting by Indication on the Remote Controller
Troubleshooting
223
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
NO
Is power supply
220~240V provided?
YES
The float switch is
NO
connected to X8A or
X15A of the indoor
unit PCB.
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
connected to X25A or
NO
terminals Y1 and Y2 of
the indoor unit PCB.
YES
The drain pump works
YES
when the power supply
is reset for the indoor
unit.
NO
The voltage of
terminals Y1 and Y2
NO
or X25A is 220~240V
(within 5 minutes of
resetting the power
supply).
YES
A short circuit
NO
connector is connected
to X8A or X15A.
YES
Becomes normal
NO
when X8A or X15A
of the indoor unit
PCB is short
circuited.
YES
The float switch NO
functions normally.
YES
SiBE31-801_C
Provide 220~240V power
supply.
Connect either a short circuit
connector or float switch and
turn on again.
Defect of indoor unit PCB.
Loose connection of
connector.
Replace the 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 the indoor unit PCB.
Replace the drain pump or
check for dirt, etc.
Troubleshooting