Viessmann Vitotwin 300-W - Page 142

142
1. Pull the leads from boiler water tem-
perature sensor
A
and check the
resistance.
10
1
10 30 50 70 90 110
Temperature in °C
0.4
0.6
0.8
2
4
6
8
20
Resistance in kΩ
Sensor type: NTC 10 kΩ
2. Check the sensor resistance and
compare it with the curve.
3. Replace the sensor in the case of
severe deviation.
Danger
The sensor is immersed in the
heating water (risk of scald-
ing).
Drain the boiler before replac-
ing the sensor.
Troubleshooting
Repairs
(cont.)
5618 294 GB