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The only thing that has not yet been touched is the inlet assembly connecting to the return flow (and back of pump), could that be clogged?

Hi Agas, yes checked that and was moderately clean, recleaned it anyway and reinstalled.

Hi Folks, I have a challenge with a Main Eco Elite 30 Combi which is short cycling on the CH. Water works fine. As soon as you have call for heat, the boiler fires up, modulates, but jumps very quickly (about 30 seconds or so from 40'ish all the way to 70, burner disengages putting it the...