Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 58

Error code
None
Remote controller:
7-segment display:
1. Applicable model
All models
2. Error detection method
3. Condition of error displayed
4. Presumable cause
• Remote controller wire
breakage/short-circuit
• Remote controller anomaly
• Malfunction by noise
• Indoor power PCB anomaly
• Broken harness
• Indoor control PCB anomaly
Note:
LED Green Red
Stays Off Keeps lighting
Indoor
Stays Off Keeps lighting
Outdoor
5. Troubleshooting
Diagnosis
loose connection of remote
controller wire broken or
Is DC15V or higher
detected between X-Y
of indoor unit terminal
Other than
FDT and
FDTC Series
Is 23V
or higher detected
between Brown-Brown at the
transformer secondary
side?
56
–
Content
Power supply system error
(Power supply to remote controller)
Isn't there any
YES
controller wires?
NO
Isn't remote
YES
short-circuited?
NO
Disconnect the
remote controller
wires.
YES
block?
NO
FDT and
FDTC Series
Is
DC18V
detected between
➀-➁ of
CNW2?
YES
NO
YES
–
Countermeasure
Correct it.
Replace wires.
Replace remote controller.
Indoor power PCB
NO
anomaly
 Replace it.
Indoor control PCB
anomaly
 Replace it.
Replace transformer.
Indoor control PCB
anomaly
 Replace it.