Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 228

Error code
Indoor control PCB
Remote control: E45
Outdoor control PCB
Outdoor inverter
1. Applicable model
Models FDC71-140VNX, 100-
140VSX, 200, 250VSA
2. Error detection method
When the communication
between inverter PCB and
outdoor unit 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 unit control PCB and
inverter PCB
• Outdoor unit control PCB
anomaly
• Outdoor fan motor anomaly
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
Keeps flashing
5. Troubleshooting
Is the
connection of connectors between
the inverter PCB and the outdoor unit
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 unit control
PCB connected properly?
YES
Replace the outdoor unit control PCB.
Does it become normal?
Red
Content Communication error between
Stays OFF
inverter PCB and outdoor unit control PCB
1-time flash
(Models FDC71-140VNX, 100-140VSX, 200, 250VSA only)
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
227
- -
'19 • PAC-T-327
Countermeasure
Correct the connection.
Set JSW10, 11 correctly.
➞ See page from 154 - 159.
No power is supplied to
inverter PCB.
Check the power source
voltage and correct it.
If not solved, find the
voltage at CN13
cause by checking
following points.
⑴
• Fan motor anomaly.
• 52X anomaly.
(FDC200,250 only)
⑵
• Broken cementresistor.
(15W)(FDC200, 250
only)
conditions, the
voltage becomes
less than DC14V
YES
Replace outdoor fan motor.
Replace outdoor unit
NO
control PCB if not solved,
replace inverter PCB as
well.
Connect the
communication wire
securely.
Replace inverter PCB.
OK