F&E tank overflowing-checked the obvious

27 Aug 2008
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United Kingdom
Hi, I have a vented central heating system with large water tank & smaller F&E tank in the attic.

The water level in the F&E tank rises until it dribbles out of the overflow pipe into the garden.

I have read the FAQ section & am working through the list.

I have changed the ballcock & replaced it with a fluidmaster one yesterday, but today, the water level has risen again overnight. The vent pipe does not seem to be dripping. I left a jug under it and not much water collected.

I turned off the stopcock to both the F&E tank/water tank & ran a bath & the level in the F&E tank actually rose slightly above the overflow pipe!

Does this indicate a cylinder coil leaking? Hot water cylinder was replaced about 5 years ago.

Or blocked pipework? a check with a magnet is mentioned. WHat is this?

ANy help gratefully received.

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ok cheers for reply Dan. Not what I wanted to hear lol, I only got the cylinder changed a few years back.
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You normally find the higher tank will fill with water

And the lower one will leak water out the over flow. If the coil has a hole in it.

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