Samsung AM032MNQDCH/AA Service Manual page 304

Troubleshooting
4-4-61 Refrigerant Leakage Error
Outdoor Unit Display
Indoor Unit Display ×(Operation)
Judgment Method • Refer to the judgment method below.
Special Cause • Leakage of refrigerant, simultaneous malfunction of pressure sensor.
Low-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 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- and low-pressure sensors is 1kgf/cm2G
1. Inspection method
high/low-pressure connector
get disconnected
from the PCB?
Is there refrigerant
inside the set? (Please check by connecting the
menufolder gauge to the
service valve)
Out of the PCB
high-pressure sensor terminals,
is there voltage between
pins 3 and 4 5V?
Replace high/low-pressure sensor
4-104
(Reservation)
Did the
Yes
Yes
Yes
(Blast) (Filter) ×(Defrost)
No
after connecting the connector
No
No
The mark is the 1st pin on the PCB.
Please re-inspect
to the PCB
Refill refrigerant
after vacuum
Replace PCB
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