Samsung ASV18PULNXEA Service Manual page 68

Indoor temperature sensor error
Indoor display
1.Checklist :
1) Is the indoor units temperature sensor connected correctly?
2) Is the sensor placed correctly?
3) Does the both terminal of sensor satisfy the resistance value in accordance with temperature?
Detach the assembled sensor from the PBA sensor
2. Troubleshooting procedure
connector and measure the sensor resistance with
ohmmeter(tester)
Is the sensor resistance value #1-#2
10kohm±3% at the room
temperature
of 25℃
Connect the sensor to PBA connector (4piin)
supply power and measure the voltage of #1-#2 in
the connector
Below 0.5V or Over 4.5V?
Micom error or connector check
YES
Exchange the indoor PBA
12-3
○ ⊙ ○
YES
NO
Indoor room temp
error
NO
YES
sensor
Sensor Replace
Sensor resistance value : 20℃ - 12.09kohm
30℃ - 8.31kohm
35℃ - 6.94kohm
40℃ - 5.83kohm
Exchange the indoor PBA