VAILLANT 0020048969 KNOBS GREY (PK3)
The control knob resides on one of the spindles located on the front of the appliance and allows you to manually control certain aspects of the boilers functionality. Some boilers enable you to change temperature and some even allow you to change the current function. This means the user can have the boiler provide central heating without the hot water being on and vice versa.
This part is present in 22 different boilers in the Vaillant.
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