How can I turn on the heating on my Vaillant combi boiler?
The pilot light is on, there is hot water, and the pressure level on the dial is fine. However, there is no heating.
Behind the front panel, there appear to be 2 switches - the right hand one is lit (water) and the left is not (heating?). It has only recently had a 4 star service - so what do we do?
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