Checking The Outlet Temperature Sensor - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Maintenance
(cont.)
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
Fig. 59 Sensor type: NTC 10 k

Checking the outlet temperature sensor

Fig. 60
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
Fig. 61 Sensor type: NTC 10 k
Ω
Ω
2. Check the sensor resistance and compare it with
the curve.
3. In the event of severe deviation replace the sensor.
Danger
The boiler water temperature sensor is
directly immersed in the heating water (risk of
scalding).
Drain the boiler on the heating water side
before replacing the sensor.
1. Pull leads from outlet temperature sensor
2. Check the sensor resistance and compare it to the
curve.
3. In the event of severe deviation replace the sensor.
Danger
The outlet temperature sensor is directly
immersed in the DHW (risk of scalding).
Drain the DHW side of the boiler before
replacing the sensor.
Troubleshooting
A .
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