Outside Temperature Sensor - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Repairs
(cont.)

Outside temperature sensor

X21 X7
X20
4 3 2 1
Fig. 33
200
100
80
60
40
20
10
8
6
-20 -10 0 10 20
Temperature in °C
Fig. 34 Sensor type: NTC 10 k
30
Ω
1. Open the control unit enclosure. See page 15.
2. Disconnect leads from outside temperature sensor.
3. Check sensor resistance and compare it to the
curve.
4. In the event of severe deviation replace the sensor.
Troubleshooting
43