Mitsubishi Electric SRK100VNPZJX, Technical Manual

Page: 380 / 509

'12 • PAC-T-174
E9
Drain trouble
(FDT, FDTC, FDU and FDUM series)
Keeps flashing 1 time flash
Keeps flashing
Stays OFF
1. Applicable model
5. Troubleshooting
FDT, FDTC, FDU and FDUM
series only
Diagnosis Countermeasure
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 DC12V
at CNI connector.
Is the
CNI 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
AC220 / 240V or DC12V
detected at CNR
connector?
NO
YES
Is the drain
piping unclogged? Is the
drain pipe slop
OK?
NO
YES
NO
YES
NO
Check float switch.
Defective indoor control
PCB
➞
Replace.
Defective indoor control
PCB
➞
Replace.
Check optional equipment
Correct setting to
“Humidifier DM interlock”.
Defective indoor control
PCB
➞
Replace.
(Replace power PCB on
FDTC series.)
Check wiring of 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 DM 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).
Error code
Remote controller:
LED Green Red
Indoor
Outdoor
Content
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