Service manual

SiUS28-902_a Troubleshooting by Indication on the Remote Controller
Troubleshooting 88
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector or parts could be damaged.
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.
Connect either a short circuit
connector or float switch and
turn on again.
YES
YES YES
YES
YES
Defect of indoor unit P.C.B.
Loose connection of connector.
NO NO
NO
YES
YES
NO
NO
YES
NO
YES
NO
NO
The float
switch is connected to
X8A (or X15A) of the indoor unit
P. C . B .
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
indoor unit
P. C . B .
The voltage
of terminals Y1
and Y2 or X25A is
208~230 V (within
5 minutes 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 (X15A).
Provide 208~230V power
supply.
YES
NO
Is power supply
208~230V provided?
Becomes
normal when X8A (or X15A)
of the indoor unit P.C.B.
is short circuited
The float switch
functions normally.
FCQ
only