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Thanks - when you advise 'there may be something wrong' with a 7 deg temp difference rather than an expected 15 is this a boiler issue or under-sizing of the radiators & therefore the output from them?

I have a recently serviced combi type Avanta Plus 35c boiler using natural gas. What values should I expect to see on the ionisation read-out (FL) for heating at these points: a) starting (nf=13), b) max fan speed (nf=35), c) fan speed (nf=19) when max flow temp achieved E1=55 with return...