F and E tank always running

[Simone]

Hi, I’ve noticed my ballcock valve is always running in the loft on the small f and e tank but when heating is on its fine, also no water coming out of the overflow, any ideas.?

 

[Peterdevon]

Sounds like you have a leak somewhere

 

[Chuck]

Need to find and fix the leak. Also, check the inhibitor concentration and top up if necessary, which will probably be the case.

 

[Last Plumber]

Leak as above or leaking coil if you have an indirect cylinder (tank fed).
What height relationship are the two tanks?

 

[Simone]

Leak as above or leaking coil if you have an indirect cylinder (tank fed).
What height relationship are the two tanks?

I’ve checked everywhere and can’t find a leak only place is a little bit of water from the safety valve next to the boiler but it’s done that for years, I’m sure the tank feeds the hot water, from what I remembered the f and e tanks sits a little lower but I might be wrong, I have had a problem for a while with the f and e filling up with water and overflowing which I’m suspecting could be a hole in the coil so maybe it’s a faulty coil.??

 

[Last Plumber]

I’ve checked everywhere and can’t find a leak only place is a little bit of water from the safety valve next to the boiler but it’s done that for years, I’m sure the tank feeds the hot water, from what I remembered the f and e tanks sits a little lower but I might be wrong, I have had a problem for a while with the f and e filling up with water and overflowing which I’m suspecting could be a hole in the coil so maybe it’s a faulty coil.??

It depends. If there's a hole in the coil, the higher tank will fill the lower tank via the hole. It would normally do that whether the heating is on or not.
A Plumber will be able to tell for definite. Don't be tempted to guess and buy a new cylinder. This is something that can be proven prior to spending (like most things).