Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 72

Error code
E9
Remote controller:
-
7-segment display:
1. Applicable model
FDT, FDTC, FDTW, FDTQ,
FDTS, FDR, FDU, FDUM, and
FDQS series
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 is disconnected or
wire broken.
4. Presumable cause
• Indoor control PCB anomaly
• Mistake in setting of float
switch
• Mistake in setting of
humidifier drain motor
interlock
• Mistake in setting of optional
equipment
• Mistake in drain piping
• Drain motor anomaly
• Disconnection/breakage of
drain motor wires
Note:
When this anomaly occurs at power ON, disconnection of connector or breakage of wire of float switch is suspected.
Check and correct it (or replace it, if necessary).
LED Green Red
Keeps flashing 1 time flash
Indoor
Keeps flashing Stays Off
Outdoor
5. Troubleshooting
Diagnosis
Check the error data in the remote controller.
Is there any overflow?
YES
Is the humidifier connected?
NO YES
Is the
humidifier Drain
Motor interlocked by the indoor unit
function setting of remote
controller?
YES
Drain motor ON from the remote controller
Does the
drain motor
operate?
YES
Is the
drain piping unclogged?
Is the drain pipe
slop OK?
70
–
Content
Drain trouble
NO
Is DC
12V detected at CN1
connector?
NO YES
Is the
CN1 connected
firmly
YES
Is there any
anomaly on the optional
equipment?
YES
NO
Is
AC220/240V
NO
detected at
CNR?
YES
NO
YES
–
Countermeasure
Check float switch.
Check the connection of
NO
CNI
If it is loose, connect it
securely
Replace indoor control
NO
PCB.
Check optional equipment
Correct setting to
"Humidifier drain motor
interlock"
Indoor control PCB
anomaly
NO
→ Replace it
Check the wiring of drain
motor
Correct it.
Check drain motor