-
125
-
'20 • PAC-SM-351
E54
1. Applicable model
5. Troubleshooting
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:
LED Green Red
Outdoor control PCB
Outdoor inverter
PCB
1-time flashKeeps flashing
Indoor control PCB
Stays OFFKeeps flashing
Content
Keeps flashing
Yellow LED
Low pressure sensor anomaly
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