-
168
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'20 • PAC-SM-351
E54
1. Applicable model
5. Troubleshooting
All models
Diagnosis Countermeasure
NO
YES
NO
YES
Replace the low pressure sensor.
Are the
connection of low pressure
sensor connectors (at sensor side
and PCB side) OK?
Are the
pressure (actual
measurement) matched with the value
indicated on the remote
control?
Is
normal condition
restored?
NO
YES
Correct low pressure sensor
connector connection.
Is refrigerant amount
charged properly?
Is there any anomaly on the
refrigeration circuit?
Defective outdoor unit
control PCB
➞
Replace.
(Defective low pressure
sensor input circuit)
OK
2. Error detection method
When anomalous voltage
(pressure) is detected
3 .
Condition of error displayed
If the pressure sensor detects
DC0V or lower and DC4.0V 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 control
PCB
• Improper amount of
refrigerant
• Anomalous refrigeration
circuit
Note:
Error code
Remote control:
Content
1-time flashKeeps flashing
Keeps flashing
––
Indoor display
RUN light TIMER light
Green LED
Yellow LED
Red LED
Outdoor unit
control PCB
Outdoor unit
inverter PCB
Low pressure sensor anomaly
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