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9-2-2 Indoor temperature sensor Error
Indoor display
7-SEG DISPLAY
C121
LED ON
LED BLINKING
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 ohmmeter(tester)
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
DESCRIPTION
Indoor room temp sensor error
LED OFF
YES
NO
YES
NO
Assy Sensor Replace
Sensor resistance value : 20°C- 12.09 kohm
YES
Exchange the indoor PBA
50
30°C - 8.31 kohm
35°C - 6.94 kohm
40°C- 5.83 kohm
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