Mitsubishi Heavy Industries FDT100VNAWVH Service Manual page 171

Error code
Indoor display
Remote control:
E54
Outdoor unit
1. Applicable model
All models
2. Error detection method
When anomalous voltage
(pressure) is detected
3. Condition of error displayed
If the pressure sensor detects 0V
or lower and 4.0V 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 main
PCB
• Improper amount of
refrigerant
• Anomalous refrigeration
circuit
Note:
RUN light
--
Green LED
control PCB
Keeps flashing
5. Troubleshooting
connection of low pressure
sensor connectors (at sensor side
measurement) matched with the value
indicated on the remote
Replace the low pressure sensor.
TIMER light
Content
--
Low pressure sensor anomaly
Red LED
1-time flash
Diagnosis
Are the
and PCB side) OK?
YES
Are the
pressure (actual
control?
NO
Is
normal condition
restored?
170
- -
'19 • PAC-SM-309
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
main PCB ➞ Replace.
(Defective low pressure
sensor input circuit)
OK
YES