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Cheep pump ! not doing what its ment to.
Discuss Vaillant EcoTEC Boiler Issue in the Plumbing Jobs | The Job-board area at PlumbersForums.net
Does it stop easly with a screw driver inside the cap?The pump is definitely spinning
Is your cylinder downstairs with the boiker upstairs? If not it seams to be plumbed in upside down.
Also are there manual air vents in the airing cupboard? If so open them to get the air out. Also bleed all rads.
Tip: sometimes running system in heating only then hot water only whilst venting can help to chase air out
Reply to Vaillant EcoTEC Boiler Issue in the Plumbing Jobs | The Job-board area at PlumbersForums.net
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