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Valiant Combi and hot Water not Working but Heating is Fine?

Postby Pooston » Wed Jan 31, 2018 9:27 pm

I'm having problems with my combi boiler. Heating works fine, but when I turn on the hot tap whilst the heating is on the boiler fires down.... and no hot water.
Once the heating is off then I can get plenty of hot water no problem.
Any ideas?
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