Low Pressure Sensor Anomaly - Mitsubishi Electric FDF71VNXVD Technical Manual

Error code
Remote controller: E54
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 3.49V 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-minuts
delay, if this anomaly occurs 3
times within 40 minutes
4. Presumable cause
• Defective low pressure sensor
connection
• Defective low pressure sensor
• Defective outdoor control
PCB
• Improper amount of
refrigerant
• Anomalous refrigeration
circuit
Note:
LED Green Red
Indoor Keeps flashing Stays OFF
Outdoor Keeps flashing 1 time flash
5. Troubleshooting
Diagnosis
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
191
–
Content

Low pressure sensor anomaly

Are the
NO
YES
Are the
YES
controller?
NO
Is
NO
restored?
YES
–
'11 • PAC-T-160
Countermeasure
Correct low pressure sensor
connector connection.
Is refrigerant amount
charged properly?
Is there any anomaly on the
refrigeration circuit?
Defective outdoor control
PCB ➞ Replace.
(Defective low pressure
sensor input circuit)
OK