overflow from expansion tank

[Fat Lady]

The tank which is filling up is the F&E tank for the central heating.

Thanks
Andrew

 

[ollski]

if your f&e is continually filling and you have hot water in it and ruled out the ball valve then your cylinder will be shot, the stored hot water will be mixing through the coil with the heating water and due to the extra heigt of the cold water storage tank it will fill the lower f&e tank and overflow.

 

[Fat Lady]

This is the problem, the tank is never reaching the overflow pipe level (I have stood and watched it for some time), it just seems to be condensation, I have started another thread about this.

The hot water is not dirty at the taps either.

How high should the water be in the F&E tank, in mine it is about 5-7cm below the overflow pipe?

Thanks
Andrew

 

[ChrisR]

This is the problem, the tank is never reaching the overflow pipe level (I have stood and watched it for some time), it just seems to be condensation,

That isn't compatible with

the expansion tank is overflowing constanly with hot water.

The level in the f/e tank should be LOW. If it's filling up, it's getting water from somewhere else. Either the float valve is leaking, or the water is getting through the HW coil from the CW storage cistern. Which is what I wrote some time ago....
Time you had another look perhaps!

 

[Fat Lady]

Sorry, this is all getting a bit confused because I have posted in another person's thread, if you could take a look at my other thread which I have started for my issue I would be greatful. It is titled "overflow - condensation"

Thanks
Andrew