'19 • PAC-SM-309
Error code
Remote control:
LED Green Red
1-time flashKeeps flashing
Stays OFFKeeps flashing
Content
Indoor unit
control PCB
Outdoor unit
control PCB
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123
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123
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E49
1. Applicable model
5. Troubleshooting
All models
Diagnosis Countermeasure
NO
*
YES
Is the low
pressure sensor connection OK
(at PCB side)?
NO
Is the
insulation resistance more than 100MΩ
at DC500V?
Is the
pressure difference less than
0.2MPa?
Is the pressure
0MPa displayed on the remote
control?
NO
YES
Check the low pressure value during
following state from the remote control
➀ Compressor is stopping
➁ Compressor is operating
During
both ➀ and ➁ state low
pressure detected at around 0MPa
without any
fluctuation.
YES
Check the insulation resistance of pressure sensor.
YES
After connecting the gauge manifold on the low pressure
line, measure at the state ➀ above. Compare the result
with the value indicated on the remote control.
NO
NO
To checking of refrigerant
amount, refrigerant circuit,
etc.
YES
Connect the pressure sensor of
spare part to outdoor unit main
PCB in the condition open to
atmosphere.
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Correct.
Replace low pressure
sensor.
Defective outdoor unit
main PCB
➞
Replace.
Replace low pressure
sensor.
2. Error detection method
Detected by low pressure drop
and suction superheat
3 .
Condition of error displayed
➀ When the low pressure sensor
detects 0.079MPa or lower
for 15 seconds continuously,
compressor stops and it
restarts automatically after
3-minute delay. And if this
anomaly occurs 5 times
within 60 minutes.
➁ 10 minutes after the
compressor starts, if the
low pressure sensor detects
0.15MPa or lower for 60
minutes continuously and
compressor suction superheat
is detected 30degC or higher
for 60 seconds continuously.
And if this anomaly occurs 5
times within 60 minutes.
➂ If low pressure sensor
detects 0.079MPa or lower
for 5 minutes continuously
(including the compressor
stop status).
4. Presumable cause
• Defective outdoor unit main
PCB
• Defective low pressure sensor
connector
• Defective low pressure sensor
• Defective suction pipe
temperature sensor connector
• Defective suction pipe
temperature sensor
Note: * Connect the gauge manifold to the service valve check joint during cooling, or connect it to the check joint at internal
piping of outdoor unit during heating.
Low pressure error (1/2)
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