overflow from expansion tank

[blueal]

Hi, hope someone can help

When heating/water first come on water drips from overflow in loft
Have replaced ball valve and turned down pump to number 1 setting.

Took water out of tank down to 4 inches but next day overflow again!

 

[Scarum]

Sounds like the coil in the hot water cylinder has a hole.

Water being heated in the cylinder has greater pressure than primary flow in the coil, the result the F&E tank fills.

 

[blueal]

Thanks very much.
Have got heating cover, hopefully that will cover this?

 

[Madrab]

Don't want to be negative but possibly not, not all heating contracts will stretch to replacing the HW Cylinder, most cover the boiler, ancillaries & valves etc though read your policy, it should state what's covered for replacement.

 

[Nige F]

You need a good plumber - if you're in E.Sx . I'm assuming you looked @ the water level in the small tank - and it had risen to the overflow and continued rising/overflowing. I ask because my neighbour had a similar scenario after a new boiler fitted - Overflow poured on occasions , I bled all the rads and it's OK now - I'm going to have a look for them in the summer . Could be a blockage somewhere

 

[blueal]

Doesn't pour out, just drips for about the first hour boiler comes on.
As said before reduced water to 4 inches depth but within a day was dripping again.