Daikin 3MKS50E3V1B Service Manual page 298

Troubleshooting for SA Indoor Unit - FCQG, FFQ, FHQ, FDBQ, FBQ Series
Troubleshooting
Note: If
defective.
286
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Is the unit
a ceiling suspended
type?
NO
Is the drain
pump connected to the
indoor unit PCB?
YES
Does
the drain pump work after
restarting operation?
YES
Is the drain water level
abnormally high?
NO
Is the float switch
connected to X15A?
YES
Remove the float switch from
X15A, short circuit X15A, and
restart operation.
A3
Does
appear on the remote
controller display?
YES
A3
is detected by the indoor unit PCB which is not mounted with X15A, the indoor unit PCB is
YES
Is the optional
YES
drain raising mechanism
connected?
NO
Is the short
circuit connector
connected to X15A on the
indoor unit
PCB?
YES
Check the
continuity of the short circuit
connector. Is there
continuity?
YES
NO
Set to
"emergency" and
NO
check the voltage of the
connector for the drain
pump. 220 ~ 240
VAC?
YES
YES
NO
NO
SiBE121135
NO
Connect the short circuit
connector.
NO
Connect the short circuit
connector.
Replace the indoor unit
PCB.
Connect the drain pump.
NO
Replace the indoor unit
PCB.
Replace the drain pump.
There is a drain system
abnormality.
Connect the float switch.
Replace the float switch.
Replace the indoor unit
PCB.
(R17250)
Service Diagnosis