Troubleshooting
Repairs
(cont.)
Outside temperature sensor
X21
X7
X20
4 3 2 1
100
80
60
40
20
10
8
6
4
-15
-5
0
-10
Temperature in °C
42
10 20 30
1. Open the control unit casing. See
page 14.
2. Disconnect leads from outside tem-
perature sensor.
3. Check the sensor resistance and
compare it with the curve.
4. Replace the sensor in the case of
severe deviation.