Mitsubishi Heavy Industries FDT71VNXVD Service Manual page 53

Error code
Remote controller: None
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
Content
Keeps flashing Stays OFF
Indoor
(Power supply to remote controller)
Keeps flashing 2 times flash
Outdoor
5. Troubleshooting
Diagnosis
Isn't there any
loose connection of remote
controller wires?
Isn't remote
controller wire broken or
short-circuited?
Disconnect remote
controller wires.
Is DC15V or
higher detected between X-Y
of indoor unit terminal
FDEN, FDUM,
FDU Series
Is 24V or higher
between (Brown-Brown) of
transformer secondary
side?

- -
Power supply system error
YES
NO
YES
NO
YES
block?
NO
FDT,
FDTC Series
Is DC180V
NO
between - of
CNW2?
YES
NO
YES
-
'10 • PAC-SM-137$
Countermeasure
Correct.
Replace wires.
Replace remote controller.
Defective indoor power
PCB Replace.
Defective indoor control
PCB Replace.
Replace transformer.
Defective indoor control
PCB Replace.