Daikin Super multi NX E Series Service Manual page 197

SiBE121135_A
Troubleshooting
Note: If
defective.
Service Diagnosis
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 (FHQ)
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
NO
"emergency" and
check the voltage of X25A.
220 - 240 VAC?
YES
YES
NO
NO
Troubleshooting for SA Indoor Unit
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.
(R18058)
186