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Hi I have an issue with my boiler. It loses pressure rapidly in the heating system. By rapid I mean from 1 bar to 0 in an hour often. Sometimes it will go much longer. It is a Grant combi with frost protection as it is external. This problem has started to occur since the weather got...

When I switch either the hot water or CH on, a red light appears after 5 seconds or so and the boiler does not fire up. If I turn it off and on again it will do the same thing. After about 20 mins of swithing off and on it may then fire up. If I leave it purring away(it sound as though...