Halstead Knobs

They also referred to as control knobs and temperature knobs, they control either the temperature or are used to switch the Halstead boiler on or off and can be found on the front of the boiler. They normally have a shaft that protrudes from the knob directly through the front of the boiler onto the printed circuit board. The shaft when turned, turns a potentiometer that's located on the printed circuit board and if the knob is turned too hard the shaft is designed to break hence protecting the Halstead printed circuit board from damage and an expensive repairs.

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