Looking for help. I have recently moved into a 3 storey house with a combi boiler on the ground floor. The basin on the third floor has plenty of pressure and flow but the flow does not fire the boiler (a Vaillant). If I turn a kitchen tap on low then boiler fires and the water upstairs is hot.
I am baffled, since the flow is good, why the boiler does not fire. Any ideas? Is the flow switch adjustable? It beats me.
Thanks for the advice, just a couple of questions. Are these readily available parts - swapped on a diy basis, or are they part of a replaceable unit. Since it is in the water system, presumably you don't need to be Corgi registered to do this kind of thing - just an amateur plumber?
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