overflow from attic tank.

bored reader

hi all

I have a problem with my attic tank overflowing randomly at odd times. it is a bigger problem when the heating is on. The house is a new build 07 terraced in an estate. is it a problem with the ball cock.
Any help appreciated
Regards
BR

Kristopherus

Spray some WD 40 on the ballcock arm end that connects to the water inlet valve, so that it moves up and down freely.

bored reader

cheers kris il try that straight away,

Wishbone Ash

The ballcock may be badly adjusted. If there is no more adjustment available, you could bend its arm slightly downwards and it should close off the inlet a bit sooner.

bored reader

ive just been up with the wd. the water seems to be up very high, approx half an inch from the outlet. I wonder is it overflow from the heating that is causing / adding to the problem?
Thanks for replies lads
Cheers

mathepac

Is the ball-cock itself leaking / filled with water? Is there an over-flow pipe on the tank itself leading out from the roof-space?

bored reader

hi mat

I checked the ballcock and it is full of water , i screwed it off and no water would come out, i didn't fully understand what you said about the outlet pipe,

There is an outlet pipe flowing fine when needed.

my thinking now is

The overflow is fine now, but when the heating sends excess water back into the tank it puts pressusre on the already full ballcock and keeps it down too long, it then gives a small but steady flow till the ballcock is able to 'barely' float again...

Does that sound right?

bored reader

also will i need a new ball cock or is there a way to salvage the old one with a clever piercing on the top somewhere?

mathepac

bored reader wrote: »

also will i need a new ball cock ...

yes you can buy the ball as an individual part and this sounds like it will resolve the issue for you.

bored reader

cheers mat will do. thanks for your help

JohnnieK

It sounds like the non-return valve on the heating system is faulty and is allowing the water to expand back up into the f&e tank (if it's a sealed system, I hope it has it's own tank and is not off the main storage tank).

If it's this type of system the feed will be half inch dropping into the hot press and connecting to the heating system. It should have an isolating valve and after that a brass cylindrical fitting with a nut either side of it. They fail a lot and either stick in the open or the closed position.