Samsung AM048FXMDCH - Error Due to Refrigerant Leakage. (E-439); Operation Prohibited Due to Low Pressure. (E-443)

66 Samsung Electronics
3-27. Error due to refrigerant leakage. (E-439) / Operation prohibited due to low pressure. (E-443)
Outdoor unit Display E-439 / E-443
Judgement Method
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(High & low pressure sensor Open / Short error occurs and 1kg/cm2 or less)
When start : When the high pressure sensor value(cooling 3.1kg/ cm2 , heating
2.2kg/ cm2 ) is detection continuously for 3 seconds.
Cause of problem
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Pressure sensor Open/Short error determination method
1) Identifies from when power is supplied or 2 minutes after RESET, and only when set is stopped.
2) An Open/Short error will occur if the input voltage standard range of 0.5V ~ 4.95V is exceeded.
Did the Pressure
sensor connector get disconnected
from the PCB?
Is there
refrigerant inside the set?
(Please check by connecting the
manifold gauge to the service
valve)
Out of the PCB
pressure sensor terminals, is there
voltage between
pins 3 and 4 5V?
Replace Low Pressure sensor.
Please re inspect after connecting the
connector to the PCB.
Refill refrigerant after vacuum.
Replace PCB.
Yes
No
Yes
Yes
No
No