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could air be trapped inside the boiler?

listened with screwdriver, removed vent plug and turned anticlockwise, not stiff at all, tested resistance of them both. Don't sound noisy at all, just normal.

i tried tapping it but no joy yet, am I doing it wrong so to speak?

thanks I'll try it now, didn't realise it has a nrv inside the boiler! Hope it frees :)

just seen the transducer resistances in the manual! Thanks for helping Agile :)

all rads seem ok, pins and all valves open sludged up where do you mean? in the pipework somewhere? :cry: Thanks for your help It is a wall hung boiler but has stroage

Hello, I hope someone can help me :) We have a Sime combi boiler, Planet Super 4 wm model The hot water is fine, but since putting the heating on again, the boiler fires up, then approx. 10 seconds later the burner goes out, pump still runs. The flow seems luke warm but return pipe...