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Thanks for that Tony Its a true system boiler, Ideal Standard Mini S24, on a sealed system. I think i've sorted the pressure problem, the fill loop was connected and appeared to be off, but was actually slightly open. The valve is faulty and will need to be replaced, but i've disconnected...

The above system boiler heats a hot water cylinder and heating for 3 bed house. Heating and water are separately controlled by means of Danfoss 24hr controller and 3 port valve. The boiler has failed to fire recently when timed, it switches itself on, does not try to fire and after about 15...