Viessmann VITODENS 242-F Installation And Service Instructions Manual page 143

Repair
(cont.)
Checking the outlet temperature sensor
A
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
1. Pull leads from outlet temperature
sensor A.
2. Check the sensor resistance and
compare it with the curve.
3. In the case of severe deviation,
replace the sensor.
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.
Troubleshooting
143