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Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Tank, supply and room temperature sensors
The supply temperature sensor can be used as a surface
contact temperature sensor or immersion temperature
sensor.
Refer to the Vitotrol 300 Installation and Service
Instructions
Sensors
IMPORTANT
Tank, supply and room temperature sensor
Note:
The supply temperature sensor can be used as
a contact or immersion temperature sensor.
Refer to the Installation and service instructions
for Vitotrol 300.
1. Pull corresponding plug.
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.
Viessmann NTC 10 k
Ω
(blue ID label)
Temperature
Resistance in k ohms
Viessmann NTC 10 k
Ω
Temperature
Resistance in k ohms
Outdoor temperature sensor
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
outdoor temperature sensor.
Troubleshooting
