Communication Error Between Inverter Pcb And Outdoor Control Pcb - Mitsubishi Heavy Industries FDT Series Technical Manual

Error code
Indoor control PCB
E45
Remote controller:
Outdoor control PCB
Outdoor inverter
1. Applicable model
Models FDC71-140
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
Communication error between
Content
Stays OFF
inverter PCB and outdoor control PCB
1 time flash
Diagnosis
NO
NO
For 3-phase models
NO
For single-phase models
Note(1) How to check
Is DC15V
detected between
YES
and on CNI3?
Note(2) Under anomalous
NO
Is DC15V
detected after disconnecting
outdoor fan motor?
NO
NO
YES
- 407 -
'12 • PAC-T-173
(Models FDC71-140)
Countermeasure
Correct the connection.
Set JSW10, 11 correctly
See page from 351 to 353.
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.
• Fan motor anomaly
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