Drain Level Control System Abnormality - Daikin 2MXS-N Series Service Manual

Troubleshooting for FFQ Series
6.2

Drain Level Control System Abnormality

A3
Error Code
Method of Error The float switch detects error.
Detection
Error Decision The water level reaches its upper limit and the float switch turns OFF.
Conditions
Supposed
Causes
Troubleshooting
Note: For the location of the switch (SS1), refer to page 26.
128
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
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
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
NO
Set the
switch (SS1) on
NO the indoor unit PCB to
emergency (EMG) and check the
voltage of X25A. 220 ~
240 VAC?
YES
YES
NO
NO
SiUS121502E
Connect the drain pump.
NO
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)
Service Diagnosis