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No, it was replaced because the engineer said that it wasn't switching over correctly - there was a pressure increase (shown on the gauge) in the CH system whenever a hot tap was opened.

I have a 2 year old 80 Eco combi boiler and the following faults have appeared. With CH on, runs normally until hot water is demanded. Turn a hot tap on and flame goes out & CH and hot water run cold With boiler set to hot water only, flame lights and water ranging randomly between luke...