Is the humidifier connected?
NO
Drain motor ON from the remote controller
YES
Does DM operate?
YES
NO
Check the error data in the remote controller.
Is there any overflow?
Is DC
12V detected at CN1
connector?
Is the
CN1 connected
firmly
NO
YES
Is there any
anomaly on the optional
equipment?
NO
YES
YES
Is the
humidifier Drain
Motor interlocked by the indoor unit
function setting of remote
controller?
NO
YES
Is
AC
220/240V
detected at both ends
of CNR?
NO
YES
*Fuse is located on the PCB for FDT
and on the wiring for other models
Is the
drain piping unclogged?
Is the drain pipe
slop OK?
NO
YES
NO
YES
NO
Check float switch.
Check the connection of
CNI
If it is loose, connect it
securely
Replace indoor control
PCB.
Option check
Correct setting to
“Humidifier DM
interlock”.
Check the wiring of Drain
Motor
Check Drain Motor
Correct.
Check drain motor.
2. Error detection method
Float switch is activated
3
.
Condition of error displayed
If the float switch OPEN
is detected for 3 seconds
continuously or if float
switch connector or wire is
disconnected.
4. Presumable cause
Defective indoor control PCB
• Float switch setting error
• Humidifier Drain Motor
interlock setting error
• Optional equipment setting
error
• Drain piping error
• Defective drain motor
• Disconnection of drain motor
wiring
Note:
When this error occurred at power ON, disconnection of wire or connector of the float switch is suspected. Check and
correct it (or replace it, if necessary).
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