Troubleshooting - Daikin FCQ18PVJU Service Manual

SiUS28-902_a

Troubleshooting

FCQ
only
Troubleshooting
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector or parts could be damaged.
NO
Is power supply
208~230V provided?
YES
The float
NO
switch is connected to
X8A (or X15A) of the indoor unit
P.C.B.
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
indoor unit
P.C.B.
YES
The drain
YES
pump works when
the power supply is reset
for the indoor
unit.
NO
The voltage
of terminals Y1
NO
and Y2 or X25A is
208~230 V (within
5 minutes of resetting
the power
supply).
YES
Troubleshooting by Indication on the Remote Controller
A short
NO
circuit connector is
connected to
X8A (X15A).
YES
Becomes
NO
normal when X8A (or X15A)
of the indoor unit P.C.B.
is short circuited
YES
NO
The float switch
functions normally.
YES
Provide 208~230V power
supply.
Connect either a short circuit
connector or float switch and
turn on again.
Defect of indoor unit P.C.B.
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 P.C.B.
Replace the drain pump or
check for dirt, etc.
88