Mitsubishi Electric FDT125VNVF Technical Manual page 428

Error code
E1
Remote controller:
1. Applicable model
All models
2. Error detection method
When normal communication
between the remote controller
and the indoor unit is
interrupted for more than 2
minutes. (Detectable only with
the remote controller)
3. Condition of Error displayed
Same as above
4. Presumable cause
• Defective communication
circuit between remote
controller-indoor unit
• Noise
• Defective remote controller
• Faulty indoor control PCB
• Defective interface kit
Note:
If the indoor unit cannot communicate normally with the remote controller for 180 seconds, the indoor unit PCB starts to
reset automatically.
RUN light TIMER light
Indoor
– –
display
Green LED Red LED
Outdoor
Keeps flashing Stays OFF
control PCB
5. Troubleshooting
Diagnosis
Is it possible to
reset normally by the
power reset?
NO
Is DC10V or
higher detected at remote controller connection
terminals?
NO
Is DC10V or higher
detected on remote controller wires if
the remote controller is
removed?
NO
Is DC10V or
higher detected at interface kit connection
terminals?
NO
Is DC10V or higher
detected on connecting wires if
the interface kit is
removed?
NO
Are wires
connected properly between the
indoor/outdoor units?
NO
Note (2) Does the remote controller still display "
after 3 minutes?
427 427
- -
Content
Remote controller
communication circuit error
YES
YES
YES
YES
YES
YES
" even
WAIT
- -
'12 • PAC-T-174
Countermeasure
Malfunction by noise
Check peripheral
environment.
Defective remote controller
Defective remote controller
Defective interface kit
Defective interface kit
Defective connecting wire.
Defective remote controller
wire (Short-circuit, etc.)
Defective indoor control
PCB ➞ Replace.