The thermistor decreases the circuit resistance as it gets hotter. The electronic control board sends a current to the thermistor and can tell whether more or less heat is needed by the resistance in the thermistor.
Welcome to Price Right Heating, one of the largest independent stockists in the UK supplying heating spare parts. We are dedicated to helping you get your spare parts as quickly as possible. We pride ourselves on providing our customers with excellent service from start to finish.