Viessmann VITODENS 200-W Installation And Service Instructions Manual page 113

Repairs
(cont.)
Checking the outlet temperature sensor or comfort sensor (only for gas condensing combi boil-
ers)
A
B
Fig. 51
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
Fig. 52 Sensor type: NTC 10 k
Ω
1. Disconnect the leads from outlet temperature sen-
sor or comfort sensor
A
2. Check the sensor resistance. Compare with the
curve.
3. In the event of severe deviation replace the sensor.
Note
Water may leak out when replacing the outlet tem-
perature sensor. Close the cold water shut-off
valve. Drain the DHW line and the plate heat
exchanger (on the DHW side).
Troubleshooting
.
B
113