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Correction. I need an eye test!!! That weren't min & max it were Auto & Manual with Open written underneath manual - just slid it to 'auto' & pump stopped as did the boiler??? Have I bu*****d it or solved it?

Thanks. Will give that a try after dinner. My mates wrong its not sludge then? :roll:

Not sure what it's meant to be set at. Min or max. :?

Yep! It has 3 ports coming from it. Slider underneath was in the middle, half way between min & max.

Any plumbers answer my question? If boiler's constantly calling for heat for either central heating OR hot water (not turned on at same time) could that be cos of sludge in the heating system? Bath water is clear no sludge in that? My mate thinks it's sludge! What controls the call for...