Header Tank Overflowing

[edition]

Hi,

Have an issue with the hot water tank header. It keeps overflowing, I have checked the ballcock and all seems fine there and the hotwater tank overflow is not throwing water back in.

All I can think is that the water is being pushed back up the exit pipe....


Any ideas?!?


Thanks!

[Arthur Jackson]

Is the central heating header water level higher than the main tank? If so it may be the coil in the cylinder is leaking.

[edition]

Thanks for the reply. No the hot water header is higher than the heating header.....

[dirkgently]

Do you have a shower mixer or a blending valve with cold mains pressure to it?

[edition]

Yes....... Hope your not going to say thats buggered!!! Just fitted that and tiled around it!!!!!

[dirkgently]

edition said:

Yes....... Hope your not going to say thats buggered!!! Just fitted that and tiled around it!!!!!

That just what I was going to say
Can you isolate the valve for proof of concept? It's propably a dirty or jammed non return valve.

[edition]

Grrrrr would fitting a 1 way valve in the hot feed to the mixer work without ripping all the tiles off!?!?

[dirkgently]

edition said:

Grrrrr would fitting a 1 way valve in the hot feed to the mixer work without ripping all the tiles off!?!?

Yes that should work.

[Ferg]

'Should' work, but mains pressure against the valve may wedge it shut stopping it from opening under the gravity pressure of the hot.

[Roo]

dirkgently said:

Do you have a shower mixer or a blending valve with cold mains pressure to it?

Had that. Needed a new valve.

Arthur Jackson said:

Is the central heating header water level higher than the main tank? If so it may be the coil in the cylinder is leaking.

And that. Had a new cylinder fitted yesterday.

[dirkgently]

Ferg said:

'Should' work, but mains pressure against the valve may wedge it shut stopping it from opening under the gravity pressure of the hot.

That could be an issue but I thought we would cross that bridge when we come to it.