Mitsubishi Electric FDT125VNVF Technical Manual page 444

Indoor display
Error code
E45
Remote controller:
inverter PCB
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
• Defective inverter PCB
• Defective connector between
the outdoor control PCB and
inverter PCB
• Defective outdoor control
PCB
• Defective outdoor fan motor
Note:
RUN light
–
Green LED
Outdoor
control PCB
Keeps flashing
Yellow LED
Outdoor
Keeps flashing
5. Troubleshooting
connection of connectors between
the inverter PCB and the outdoor
control PCB OK?
Are both
switches of JSW10,11
on the inverter PCB
set correctly?
on the inverter PCB
flashing?
communication wire between the
inverter PCB and the outdoor control
PCB connected properly?
Replace the outdoor control PCB
Does it become normal?
TIMER light
Content
–
Communication error between
Red LED
1 time flash
inverter PCB and outdoor control PCB
Diagnosis
Is the
YES
YES
Is LED
NO
For single-phase models
YES
Is DC15V
detected between ②
YES
and ③ on CNI3?
NO
Is DC15V
detected after disconnecting
outdoor fan motor?
Is the
YES
443
- -
Countermeasure
Correct the connection.
NO
Set JSW10, 11 correctly
NO
⇒ See page 346 or 347.
For 3-phase models
No power is supplied to
inverter PCB.
Check the power supply
voltage and correct it
If not solved, find the
Note(1) How to check
voltage at CN13
cause by checking
⇒See E51
following points.
⑴
• Fan motor anomaly
⑵
Note(2) Under anomalous
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
NO
communication wire
securely
Replace inverter PCB
NO
OK
YES
'12 • PAC-T-174