E45 Communication Error Between Inverter Pcb And Outdoor Control Pcb - Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual

Error code
Indoor control PCB
Remote control: E45
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
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
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
Diagnosis
NO
NO
For 3-phase models
NO
For single-phase models
Note(1) How to check
→See E51
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
170
- -
'12 • PAC-T-178
Countermeasure
Correct the connection.
Set JSW10, 11 correctly
➞ See page from 124 to 126.
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
following points.
⑴
• Fan motor anomaly
⑵
conditions, the
voltage becomes
less than DC14V
YES
Replace outdoor fan motor
Replace outdoor control
NO
PCB if not solved, replace
inverter PCB as well
Connect the
communication wire
securely
Replace inverter PCB
OK