Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 241

Error code
Indoor control PCB
Remote control:
E54
Outdoor control PCB
Outdoor inverter
1. Applicable model
Models FDC71-140VNX, 100-
140VSX, 200, 250VSA
2. Error detection method
When anomalous voltage
(pressure) is detected
3. Condition of error displayed
If the pressure sensor detects
DC0V or lower and DC4.0V
or higher for 5 seconds
continuously within 2 minutes
to 2 minutes 20 seconds after
compressor ON, the compressor
stops. When the compressor
is restarted automatically after
3-minute delay, if this anomaly
occurs 3 times within 40 minutes.
4. Presumable cause
• Defective low pressure sensor
connection
• Defective low pressure sensor
• Defective outdoor unit control
PCB
• Improper amount of
refrigerant
• Anomalous refrigeration
circuit
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
Keeps flashing
5. Troubleshooting
connection of low pressure
sensor connectors (at sensor side
and PCB side) OK?
pressure (actual
measurement) matched with the value
indicated on the remote
Replace the low pressure sensor.
normal condition
-
Red
Content
Stays OFF
Low pressure sensor anomaly
1-time flash
(Models FDC71-140VNX, 100-140VSX, 200, 250VSA only)
Diagnosis
Are the
YES
Are the
control?
NO
Is
restored?
240
-
'19 • PAC-T-327
Countermeasure
Correct low pressure sensor
NO
connector connection.
Is refrigerant amount
YES
charged properly?
Is there any anomaly on the
refrigeration circuit?
Defective outdoor unit
NO
control PCB ➞ Replace.
(Defective low pressure
sensor input circuit)
OK
YES