Product Information: The thermistor decreases the current resistance as it gets hotter. The electronic control board sends a current to the thermistor and can tell whether an increase or decrease in heat is needed by the relative resistance in the thermistor.
This part is present in 3 different boilers in the Saunier Duval range including the Saunier Duval THELIA 623 NC , THELIA 623 , THELIA 623 NC .