Daikin SKYAIR Service Manual page 22

Description Drain Pump Abnormality
Supposed Cause 1. Malfunctioning drain pump.
2. Improper drain piping work.
3. Drain piping clogging.
4. Malfunctioning fl oat switch.
5. Malfunctioning indoor unit PC board.
Troubleshooting
There is a mulfunction
Begin
Is a drain
No
pump connected to
the indoor unit
PCB?
Yes
Does the
No
drain pump work
after restarting
operation?
Yes
Is the
No
drain water level
abnormally
high?
Yes
of the drain system.
A3
Connect the
drain pump.
Is the
Connect
No
float switch
float
connected to
switch.
A5?
Yes
Remove the
float switch from
A5, short-circuit
A5, and restart
operation.
Does "A3"
No
appear on the
remote controller
display?
Yes
Replace indoor
unit PC board.
Service Diagnosis
Set to
"emergency"
and check the
voltage of
X25A.
Replace
No
indoor
220-240
unit PC
VAC?
board.
Yes
Replace the
drain pump.
Replace float
switch.
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