71
9-2-4 Outdoor temperature sensor error
Indoor display
7-SEG DISPLAY
DESCRIPTION
C221
Outdoor temperature sensor error
Outdoor display
Outdoor temperature sensor error
LED ON
LED BLINKING
LED OFF
1. Checklist :
1) Is the sensor connected correctly?
2) Is the sensor placed correctly?
3) Does the both terminal of sensor satisfy the resistance value in accordance with temperature?
4) Is the resistance value of sensor connection pull-up correct?
2. Troubleshooting procedure
Model
“A”
“B”
ALL
CN251
CN251 #1-#2
YES
YES
NO
NO
NO
YES
YES
Is the sensor connector(“A”) connected
correctly in accordance with a color?
Is the sensor resistance value
“B” 10kohm±3% at the room temperature
of 25
℃ ?
Reconnect the sensor connector.
Sensor Replace
Sensor resistance value : 20 - 12.09 kohm
30 - 8.31 kohm
35 - 6.94 kohm
40 - 5.83 kohm
Exchange the Outdoor PBA
Connect the sensor to PBA connector supply
power and measure the voltage of "B"in the
connector
Below 0.5Vdc or Over 4.5Vdc?
Micom error or connector check
Exchange the Outdoor PBA
