Viessmann VITODENS 200-W Installation And Service Instructions Manual page 132

Troubleshooting
Repairs
(cont.)
Checking the outlet temperature sensor or comfort sensor
(combi boilers only)
B
132
Sensor type: NTC 10 kΩ
1. Disconnect the leads from outlet tem-
2. Check the sensor resistance and
3. Replace the sensor in the case of
A
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
perature sensor A or comfort sensor
B.
compare it with the curve.
severe deviation.
Note
Water can leak when replacing the
outlet temperature sensor. Close the
cold water shut-off valve. Drain the
DHW line and the plate heat
exchanger (DHW side).