Mitsubishi SCM40ZJ-S Service Manual page 133

Error code
Remote controller: E54
1. Applicable model
Model SCM100, 125 only
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 high pressure sensor
connection
• Defective high pressure sensor
• Defective outdoor control
PCB
• Improper amount of
refrigerant
• Anomalous refrigeration
circuit
Note:
LED Green Red
Indoor Keeps flashing Stays OFF
Outdoor – 8 times flash
5. Troubleshooting
Diagnosis
Are the
connection of high pressure
sensor connectors (at sensor side
and PCB side) OK?
YES
Are the
pressure (actual
measurement) matched with the value
indicated on the remote
controller?
NO
Replace the high pressure sensor.
Is
normal condition
restored?
High pressure sensor output characteristics
3.5
2.0
0.5
0 2.08
Pressure (MPa)
Note(1) Sensor output：Black (GND) –White
Output voltage：Black – Red(DC5V)
132
-
Content
High pressure sensor anomaly
（ Model SCM100 , 125 ）
NO
YES
NO
YES
4.15
-
'11 • SCM-SM-110
Countermeasure
Correct high pressure sensor
connector connection.
Is refrigerant amount
charged properly?
Is there any anomaly on the
refrigeration circuit?
Defective outdoor control
PCB ➞ Replace.
(Defective high pressure
sensor input circuit)
OK