H/W Cylinder fills Header Tank

14 Feb 2010
Reaction score
United Kingdom
Hot water is flowing from the hot water cylinder into the header tank through the header pipe (reverse flow).
No water is passing through the expansion/overflow pipe from the top of the cylinder into the cold water header tank.
The expansion/filler tank for the central heating is constantly refilling.
Any comments suggestions will be gratefully recieved, thank you.
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If your header tank & F&E tanks are at different levels, then this can happen when your cylinder coil is knackereed.

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