Samsung AM032MNQDCH/AA Service Manual page 291

4-4-48 Low Pressure sensor error (Open/Short)
Outdoor unit display
Indoor unit display
Judgment Method ∙ Refer to the judgment method below.
Cause of problem ∙ Disconnection or breakdown of relevant sensor.
1. 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 Open/Short error will occur if the input voltage standard range of 0.5V ~ 4.95V is exceeded.
2. Inspection Method
Did the Low Pressure sensor connector
get disconnected from the PCB?
Is there refrigerant inside the set?
(Please check by connecting the menu
folder gauge to the service valve)
Out of the PCB Low Pressure
sensor terminals, is there voltage between
pins 3 and 4 5V?
Replace Low Pressure sensor
Samsung Electronics
(Operation) (Reservation)
Yes
Yes
Yes
(Blast) ×(Filter) ×(Defrost)
No
No
No
The mark is the 1st pin on the PCB.
Troubleshooting
Please re-inspect after connecting
the connector to the PCB
Refill refrigerant after vacuum
Replace PCB
4-91