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I had a new ignition box fitted last year because it kept locking out and it's been OK since, until I began using the central heating this year. Now it just stops heating the water but doesn't lock out, and the pump keeps running. If I switch it off, it will start up again most times, though...

The boiler is about 9 years old, and is situated in a cupboard in a bedroom. It began locking out a while back, before the CH was switched on for the winter, and has gradually got worse. A corgi fitter spent a couple of hours with it, cleaning etc, but the problem is still there. It will nearly...