Mitsubishi Heavy Industries FDC112KXEN6 Technical Manual page 329

Error code
Remote controller: None
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
• Defective remote controller
• Malfunction by noise
• Faulty indoor power PCB
• Broken harness
• Faulty indoor control PCB
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
Disconnect remote
Is DC15V or higher
detected between X-Y
of indoor unit terminal
Other than
FDT Series
Is 23V
or higher detected
between (Brown-Brown) of
transformer secondary
side?
325
–
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
controller wires.
YES
block?
NO
FDT Series
Is
DC18V
detected between
�-� of
CNW2?
YES
NO
YES
–
Countermeasure
Correct.
Replace wires.
Replace remote controller.
Replace power PCB.
NO
Replace control PCB.
Replace transformer.
Replace indoor control
PCB.