Service Manual

Troubleshooting for FFQ Series SiUS121502E
128 Service Diagnosis
6.2 Drain Level Control System Abnormality
Error Code
A3
Method of Error
Detection
The float switch detects error.
Error Decision
Conditions
The water level reaches its upper limit and the float switch turns OFF.
Supposed
Causes

Defective drain pump

Improper drain piping work

Clogged drain piping

Defective float switch

Defective indoor unit PCB

Defective short circuit connector X15A on indoor unit PCB
Troubleshooting
Note: For the location of the switch (SS1), refer to page 26.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Connect the drain pump.
Replace the indoor unit
PCB (control PCB).
Replace the drain pump.
There is a drain system
abnormality.
Connect the float switch.
Replace the float switch.
Replace the indoor unit
PCB (control PCB).
(R22268)
NO
YES
NO
NO
YES
YES
Is the drain
pump connected to the
indoor unit PCB?
NO
Is the drain water level
abnormally high?
YES
YES
Is the float switch
connected to X15A?
NO
Does the
drain pump work after
restarting operation?
Set the
switch (SS1) on
the indoor unit PCB to
emergency (EMG) and check the
voltage of X25A. 220 ~
240 VAC?
YES
Remove the float switch from
X15A, short circuit X15A, and
restart operation.
NO
Does A3
appear on the remote
controller display?