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When the remote stat call for heat the boiler is operating in short burst say comes on for 30 secs goes off comes on again a minute later stays on for 30 secs goes off and so on. Works fine for hot water, pump runs ok but because the boiler cut off very quick the flow pipes do not get hot...

Have a issue with the DHW control on Combi 80 boiler. When we turn on the hot tap the plunger which operates the micro switch deos not seem to move much, have changed the diaphram inside the housing this was not new but an old unit that was given to us by a friend and greased the little plastic...