Samsung AR09RXPXBWKNEU, Service Manual, Page: 94 / 128

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10-2-2 Indoor temperature sensor Error
Indoor display
3-LED DISPLAY
7-SEG DISPLAY DESCRIPTION
LED1 LED2 LED3
◎
E121 Indoor room temp sensor error
●
LED ON
◎
LED BLINKING
LED OFF
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
YES
YES
NO
NO
YES
Detach the assembled sensor from the PBA
sensor connector and measure the sensor
resistance with ohmmeter(tester)
Assy Sensor Replace
Sensor resistance value : 20°C- 12.09 kohm
30°C - 8.31 kohm
35°C - 6.94 kohm
40°C- 5.83 kohm
Is the sensor resistance value
10kohm±3% at the room temperature
of 25°C ?
Connect the sensor to PBA connector (6pin)
supply power and measure the voltage of #1-#2
in the connector
Below 0.5V or Over 4.5V?
Micom error or connector check
Exchange the indoor PBA
Exchange the indoor PBA