Samsung AR18HSFNBWKNEU Service Manual page 81

10-2-2 Indoor temperature sensor Error
Indoor display
7-SEG DISPLAY
E121
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?
2. Troubleshooting procedure
Detach the assembled sensor from the PBA sensor
connector and measure the sensor resistance with
Is the sensor resistance value
10kohm±3% at the room temperature
Connect the sensor to PBA connector (6piin)
Is the connection of power cable
supply power and measure the voltage of #1-#2 in
and communication cable normal?
Below 0.5V or Over 4.5V?
Micom error or connector check
Exchange the indoor PBA
Samsung Electronics
DESCRIPTION
Indoor room temp sensor error
ohmmeter(tester)
of 25°C
YES
the connector
NO
YES
NO
Ass'y Sensor Replace
Sensor resistance value : 20°C- 12.09kohm
YES
Exchange the indoor PBA
30°C - 8.31kohm
35°C - 6.94kohm
40°C- 5.83kohm
10-3