Is anomalous
pressure detected?
Is the
connector of the
faulty sensor inserted
properly to the connector on
the outdoor control
PCB?
Save data for 30 minutes before stopping in Mente PC
Reset the power and restart operation.
Check the data for 30 minutes before stopping
YES
YES
NO
YES
High pressure sensor
output characteristics
Sensor output Black (GND) – White; Output voltage (Black – Red; DC5V)
Pressure (MPa) Pressure (MPa)
Low pressure sensor
output characteristics
NO
NO
NO
Does it recur?
Does
the pressure
converted from the
sensor output voltage match the
actual pressure measure
by pressure
gauge?
YES
Output voltage (V)
Output voltage (V)
Check and save the data of
operating condition.
Check the conditions
whether it occurs
immediately after the
power on or during
operation or stopping.
Check also sensor value.
Insert connector securely
and restart operation.
Temporary malfunction by
noise. Correct if source of
noise is identified.
Replace sensor.
Replace outdoor control
PCB.
2. Error detection method
Detection of anomalous voltage
(pressure)
Operating range
High pressure 0 – 4.15MPa
Low pressure 0 – 1.7MPa
3
.
Condition of error displayed
Sensor output voltage
0V or lower
3.49V or higher
Detected for 5 seconds within
2 minutes to 2 minutes and 20
seconds after the compressor
ON.
4. Presumable cause
• Disconnected sensor harness
• Disconnected sensor
connector
• Faulty sensor
• Defective outdoor control
PCB
• Faulty installation conditions
• Insufficient airflow volume
• Excessive or insufficient
refrigerant amount
Note:
*1 E54-1/1 time flash: Low pressure sensor anomaly, E54-2/2 times flash: High pressure sensor anomaly
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