135
Checking the outside temperature sensor (weather-compensa-
ted control unit)
X3
100
10
-20 -10 0 10 20 30
Temperature in °C
6
8
20
40
60
80
200
Resistance in k
Ω
Sensor type: NTC 10 kΩ
1.
Pull plug "X3" from the control unit.
2.
Test the resistance of the outside
temperature sensor across terminals
"X3.1" and "X3.2" on the disconnec-
ted plug and compare it with the
curve.
3.
Where actual values deviate severely
from the curve values, disconnect the
wires at the sensor and repeat test on
the sensor itself.
4.
Depending on the result, replace the
lead or the outside temperature sen-
sor.
Troubleshooting
Repair
5623 520 GB
Service
