Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 68

Error code
E3/5
Remote controller:
-
7-segment display:
1. Applicable model
All models
2. Error detection method
No outdoor unit exists in the
same superlink system.
3. Condition of error displayed
Same as above
4. Presumable cause
• Power is not supplied to the
outdoor unit
• Unmatch of pairing between
indoor and outdoor units
• Indoor control PCB anomaly
• Outdoor control PCB
anomaly
• Missing local wiring
Note:
LED Green Red
Keeps flashing 2 times flash
Indoor
Keeps flashing Stays Off
Outdoor
5. Troubleshooting
Diagnosis
E3 is a communication error that occurs when communication between
indoor and outdoor units is not established at all. Once the communication
between indoor and outdoor units is established, it changes to E5.
In both cases, check signal line wired locally
Reset the power supply and restart.
Does E3/E5 occurs?
YES
Is protective
fuse for the super link
circuit blown?
NO
Is the LED
on indoor control
PCB OK?
YES
Is the power
supply to outdoor
unit OK?
YES
Is the
outdoor unit address
set on the indoor unit
OK?
YES
Is the
superlink communication
wire connection
OK?
66
–
Content
Outdoor unit signal line error
NO
YES
NO
NO
NO
NO
YES
–
Countermeasure
Temporary malfunction by
noise.
Identify the source of noise
and correct it.
Change to spare circuit.
Indoor control PCB
anomaly
 Replace it
Correct it.
Correct it.
Correct it.
Outdoor control PCB
anomaly
 Replace it