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281
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15
Error display :
E49
[Anomalous low pressure or low pressure sensor disconnection.]
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
YES
YES
NO
NO
Correct it
Replace the low
pressure sensor
NO
Replace the outdoor
unit control PCB.
Does the error resolved?
Compressor
stop
Compressor
operation
0.079
0.227
Low pressure (MPa)
·
Set low pressure for protective control
Is there any gap between actual
pressure and sensed pressure by
the microcomputer?
Are the low pressure sensor
connector connected
properly(sensor side, PCB side)?
Is the amount of the refrigerant proper?
Is there any irregularity on the
refrigerant circuit?
•
Display Conditions
The compressor is stopped when the low pressure becomes
0.079 MPa or lower for 15 seconds continuously, or when it
becomes 0.15 MPa or lower and the superheat becomes 30K or
bigger for 1 minute. The compressor will restart automatically
after 3-minute delay.
The error occurs when the situation happens 3 times within 60
minutes, or the low pressure stays 0.079 MPa or lower for 5
minutes continuously.
[Only case of 302 ~ 1002 models]
Is the low pressure during
operation normal?
Charge with refrigerant.
NO
YES
Are the low
pressure sensor – suction pipe
temperature thermistor
characteristics OK?
Low pressure sensor – suction pipe
temperature thermistor is faulty Replace it
NO
YES
Are the low
pressure sensor – suction pipe
temperature thermistor connector
connected properly?
Correct it
NO
YES
Is the service
valve fully open?
Open it fully.
NO
YES
Outdoor control PCB is faulty Replace it
(Low pressure sensor – suction pipe temperature
thermistor input circuit is faulty.)
