Drain Water Level Control System Abnormality - Daikin MKS-T Series Service Manual

SiSG121917E
6.2

Drain Water Level Control System Abnormality

A3
Error Code
Method of Error
The float switch detects error.
Detection
Error Decision When the water level reaches its upper limit and when the float switch turns OFF
Conditions
Supposed
 Defective drain pump
Causes  Improper drain piping work
 Clogged drain piping
 Defective float switch
 Defective indoor unit PCB
 Defective short circuit connector X15A on indoor unit PCB
Troubleshooting
Notes
 Switch: DS1 on control PCB
For the location of the DIP switch, refer to page 34.
Part 6 Service Diagnosis
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
Troubleshooting for MSP Duct Type Indoor Unit
NO
Set the
switch# on
NO the indoor unit PCB to
emergency (EMG) and check the
voltage of X25A. 220 ~
240 VAC?
YES
YES
NO
NO
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)
128