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You're a helpful bunch aren't you :) Think it's either the pcb, or a circulation issue. Think the pump works ok I'll check again when I'm back and maybe give it a mains flush. When calling for heat there's no life at all, the reset button does nothing. Turning off at the wall then on again...

No it's a dirtmag/altecnic. Haven't cleaned it out.

Been looking at this ideal isar combi. It's got hot water but no heating. The stat and receiver are communicating with each other. So I thought it might be the diverter valve. But the boiler does fire up sometimes but for only a brief time. Is this the pcb or a circulation issue. The pump works...