Mitsubishi Electric FDT125VNVF Technical Manual page 399

Error code
Indoor control PCB
E45
Remote controller:
Outdoor control PCB
Outdoor inverter
1. Applicable model
All models
2. Error detection method
When the communication
between inverter PCB
and outdoor control PCB
is not established.
3. Condition of Error displayed
Same as above.
4. Presumable cause
• Inverter PCB anomaly
• Anomalous connection
of connector between the
outdoor control PCB and
inverter PCB
• Outdoor control PCB anomaly
• Outdoor fan motor anomaly
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED or Red LED Green LED
PCB
Keeps flashing
5. Troubleshooting
Is the
connection of connectors between
the inverter PCB and the outdoor
control PCB OK?
YES
Are both
switches of JSW10,11(SW1, 2)
on the inverter PCB
set correctly?
YES
Is LED
on the inverter PCB
flashing?
YES
Is the
communication wire between the
inverter PCB and the outdoor control
PCB connected properly?
YES
Replace the outdoor control PCB
Does it become normal?
Red
Content
Stays OFF
Communication error between
1 time flash
inverter PCB and outdoor control PCB
Keeps flashing
Diagnosis
NO
⑴
NO
Note(1) Figure in ( ) is for models 200, 250
For 3-phase models
NO
For single-phase models
Note(1) How to check
Is DC15V
detected between ②
YES
and ③ on CNI3?
Note(2) Under anomalous
NO
Is DC15V
detected after disconnecting
outdoor fan motor?
NO
NO
YES
398
- -
'12 • PAC-T-174
Countermeasure
Correct the connection.
Set JSW10, 11(SW1, 2)
correctly
⇒  S ee page from 346 to
348.
No power is supplied to
inverter PCB.
Check the power supply
voltage and correct it
If not solved, find the
voltage at CN13
cause by checking
⇒See E51
following points.
⑴
• Fan motor anomaly
• 52X anomaly (models
200, 250 only)
⑵
• Broken cement resistor
(15Ω) (models 200, 250
only)
conditions, the
voltage becomes
less than DC14V
YES
Replace outdoor fan motor
Replace control PCB
NO
if not solved, replace
inverter PCB as well
Connect the
communication wire
securely
Replace inverter PCB
OK