The Vaillant negative temperature coefficient sensor decreases circuit resistance in line as the temperature increases. The boiler's printed control board sends a current to the thermistor, deciding whether a decrease or increase in heat is required by reading the relative resistance.
Genuine replacement part for Vaillant
Technical specification
Waist Sizeaa25cd94fwTypeSensorCompatible WithEcotec Plus 831 R1, Ecotec Plus 837 R1, Ecotec Exclusive 832 and Ecotec Exclusive 838Supplier Part Number193592Brand NameVaillant
Reviews
Vaillant Negative Temperature Coefficient Sensor 193592