C17400090 Potentiometer knob

Keston C17400090 Potentiometer knob

This part fits the following:

• Keston C40
• Keston C40P
• Keston C55
• Keston C55P
• Keston C90
• Keston C110

The control knob resides on one of the spindles located on the front of the control panel and allows the user to manually control certain aspects of the boilers operation.

Some boilers enable you to change temperature and some allow you to change the function.

This means the user can have the boiler produce hot water without the central heating being on and vice versa.