Mitsubishi Heavy Industries SCM71ZM-S1 Technical Manual page 260

Error code
E9
Remote control:
1. Applicable model
FDTC and FDUM series only
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 or
power 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).
LED Green Red
Keeps flashing 1-time flash
Indoor
– Stays OFF
Outdoor
5. Troubleshooting
Diagnosis
Check the error data in the remote control.
Is there any overflow?
YES
Is the humidifier connected?
YES
Is the
humidifier drain motor
interlocked by the indoor unit function
setting of remote
control?
YES
Drain motor ON from the remote control
Does drain motor operate?
YES
Is the drain
piping unclogged? Is the
drain pipe slop
OK?
259
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Content
Drain trouble
（ FDTC and FDUM series ）
NO
Is DC 12V
at CNI connector.
NO
YES
Is the
CNI connected
NO
firmly?
YES
Is
there any
NO
anomaly on the optional
equipment?
YES
NO
NO
Is
AC220/240V
（FDUM: DC12V）
NO
detected at CNR
connector?
YES
NO
YES
-
'17 • SCM-T-225
Countermeasure
Check float switch
Defective indoor control
PCB ➞ Replace.
Defective indoor control
PCB ➞ Replace.
Check optional equipment
Correct setting to
"Humidifier drain motor
interlock".
Defective indoor power
NO
PCB ➞ Replace.
（ FDUM: Indoor control PCB ）
Check wiring of drain
motor
Correct.
Check drain motor.