Outside Temperature Sensor; Flue Gas Temperature Sensor - Viessmann VITOTRONIC300 Installation And Service Instructions Manual

Vitotronic 300, GW2B Installation and Service
Sensors
(continued)
Temperature
Temperature

Outside temperature sensor

Viessmann NTC 10 kΩ
1. Pull plug !.
2. Check the sensor resistance across plug terminals
"1" and "2" and compare with the curve.
3. If the results are very different from the curve,
disconnect the wires from the sensor and repeat the
test on the sensor.
4. Depending on the result, replace the lead or the
outside temperature sensor.

Flue gas temperature sensor

Viessmann NTC 20 kΩ (orange identification)
When an entered limit in the Vitotronic 300 is reached
(see coding address "1F" in "Boiler") group, a service
display appears.
1. Disconnect plug aG.
2. Check the sensor resistance and compare it with the
curve.
3. In the case of severe deviation, check the installation
and replace the sensor if required.
Components
125