Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 142

Troubleshooting
Repair
(cont.)
Checking the outlet temperature sensor
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
Sensor type: NTC 10 kΩ
142
1. Pull leads from outlet temperature
sensor A.
2. Check the sensor resistance and
compare it with the curve.
3. Replace the sensor in the case of
severe deviation.
Danger
The outlet temperature sen-
sor is immersed in the DHW
(risk of scalding).
Drain the DHW side of the
boiler before replacing the
sensor.