Vaillant Thermistors (Page 2)
The thermistor decreases circuit resistance as the temperature of the thermistor rises. The electronic control board sends a current to the thermistor and can tell whether an increase or decrease in heat is needed by the resistance provided by the thermistor.
Vaillant 0010031609 Tube With Sensor - ETec+/Ecotec+/Ecotec Plus VU
Part No: 1371985 MPN: 0010031609