Glow-worm Knobs

They are also referred to as control knobs and temperature knobs, they control either the temperature or are used to switch the Glow-worm 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 Glow-worm printed circuit board from damage and an expensive repairs.

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