Refrigerant Leakage Error - Samsung AM040KXMDEH/EU Service Manual

Troubleshooting
4-3-12 Refrigerant leakage error (Error Code : E439)
1. Determining high/low-pressure sensor OPEN/SHORT error
1) Identifies from when power is supplied or 2 minutes after RESET, and only when set is stopped.
2) An E439 error will occur if the input voltage standard ranges of 0.5V ~ 4.95V of both the high- and low-pressure sensors are
exceeded.
3) Will occur if the measured value of both high/low-pressure sensors is 1kgf/cm²G.
2. How to check
Did the high/low-pressure
connector get disconnected
from the PCB?
Is there refrigerant inside
the set? (Please check by connecting the manifold
gauge to the service valve)
On the high-pressure sensor
of the PCB, is the value of voltage 5V,
between pins 3 and 4?
Replace the high/low-pressure sensor
34
Yes
Yes
Yes
No
Replace the high/low-pressure sensor
No
Refill refrigerant after vacuum
No
The ▼ mark is the 1st pin on the PCB.
Replace the PCB
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