Samsung AM032MNQDCH/AA Service Manual page 290

Troubleshooting
4-4-47 High Pressure sensor error (Open/Short)
Outdoor unit display
Indoor unit display × ( Operation )
Judgment Method ∙ Refer to the judgment method below.
Cause of problem ∙ Disconnection or breakdown of relevant sensor.
1. High 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 High 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 High Pressure
sensor terminals, is there voltage between
pins 3 and 4 5V?
Replace High Pressure sensor
4-90
( Reservation ) ( Blast )
Yes
Yes
Yes
( Filter ) × ( Defrost )
No
Please re-inspect after connecting
the connector to the PCB
No
Refill refrigerant after vacuum
No
The mark is the 1st pin on the PCB.
Replace PCB
Samsung Electronics