Mitsubishi Electric FDT125VNVF Technical Manual page 429

Error code
E5
Remote controller:
1. Applicable model
All models
2. Error detection method
When normal communication
between indoor and outdoor
unit is interrupted for more than
2 minutes.
3. Condition of Error displayed
Same as above is detected
during operation.
4. Presumable cause
• Unit No. setting error
• Broken remote controller wire
• Faulty remote controller wire
connection
• Faulty outdoor control PCB
Note:
Pressing the pump-down switch cancels communications between indoor and outdoor unit so that "communication
error-E5" is displayed on indoor unit and remote controller, but it is normal.
RUN light TIMER light
Indoor
ON 6 times flash
display
Green LED Red LED
Outdoor
Keeps flashing See below
control PCB
5. Troubleshooting
Diagnosis
In case that the outdoor unit red LED flashes 2-times
Note (1) Inspect faulty connections (disconnection,
Is the
connection of signal
wires at the outdoor unit
side OK?
YES
Note (2) Check for faulty connection or breakage of
Is the
connection of signal
wires between indoor-outdoor
units OK?
YES
Power reset
Has the remote
controller LCD returned to
normal state?
In case that the outdoor unit red LED stays OFF
Power reset
NO
Has the remote
controller LCD returned to
normal state?
428 428
- -
Content
Communication error during operation
looseness) on the outdoor unit terminal block.
NO
signal wires between indoor-outdoor units.
NO
NO
YES
NO
YES
- -
'12 • PAC-T-174
Countermeasure
Repair signal wires.
Repair signal wires.
To the diagnosis of
" "
WAIT
Unit is normal.
(Malfunction by temporary
noise, etc.)
Defective outdoor control
PCB (Defective network
communication circuit) ➞
Replace.
Unit is normal.
(Malfunction by temporary
noise, etc.)