High Pressure Sensor Anomaly (Psh), Low Pressure Sensor Anomaly (Psl) - Mitsubishi Heavy Industries FDC280KXZE1 Service Manual

Error code
E54
Remote control:
E54-1, 2 *1
7-segment display:
*1 E54-1: 1-time flash (PSL), E54-2 : 2-time flash (PSH)
1. Applicable model
Outdoor unit
2. Error detection method
Detection of anomalous pressure
(voltage) of PSH or PSL.
[
Operation range
High pressure : 0-4.15MPa
Low pressure : 0-1.7MPa
3. Condition of error displayed
If anomalous sensor output
voltage (0V or lower or 3.49V
or higher) is detected for 5
seconds within 2 minutes to 2
minutes 20 seconds after the
compressor ON.
4. Presumable cause
• Broken sensor harness
• Disconnection of sensor
harness connection (connector)
• Sensor (PSH, PSL) anomaly
• Outdoor control PCB anomaly
• Anomalous installation conditions
• Insufficient airflow volume
• Excessive or insufficient
refrigerant amount
Note:
LED Green
Keeps flashing Stays OFF
Indoor
Keeps flashing
Outdoor
5. Troubleshooting
Save data for 30 minutes before stopping in Mente PC.
Check the data for 30 minutes before stopping.
Is anomalous
pressure detected?
NO
]
Reset the power and restart operation.
High pressure sensor
output characteristics
Pressure (MPa)
Sensor output Black (GND) – White; Output voltage (Black – Red; DC5V)
Red
Content
High pressure sensor anomaly (PSH)
Low pressure sensor anomaly (PSL)
*1
Diagnosis
YES
Is the
connector of the
sensor inserted properly to
the connector on the
outdoor control
PCB?
YES
Does E54 recur?
YES
Does
the pressure
converted from the
sensor output voltage match the
actual pressure measure
by pressure
gauge?
Low pressure sensor
output characteristics
Pressure (MPa)
118
– –
'14 • KX-SM-202
Countermeasure
Check and save the data of
operating conditions.
Check the conditions
whether it occurs
immediately after the
power on or during
operation or stopping.
Check the sensed value.
NO
Insert the connector
securely and restart
operation.
NO
Temporary malfunction by
noise.
Correct if the source of
noise is specified.
NO
Replace sensor (PSH, PSL)
YES
Replace outdoor control
PCB.