3-21 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
Replace the high/low-pressure sensor
Replace the high/low-pressure sensor
No
Yes
Did the high/low-pressure
connector get disconnected
from the PCB?
Refill refrigerant after vacuum
No
Yes
Is there
refrigerant inside the set?
(Please check by connecting the manifold
gauge to the service valve)
Replace the PCB
No
Yes
On the high-pressure sensor
of the PCB, is the value of voltage 5V,
between pins 3 and 4?
The ▼ mark is the 1st pin on the PCB.
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