Overflow pipe dripping

Question

An overflow pipe just under our roof has started leaking. When I switched the hot water off on our gravity fed boiler it stopped, any idea what’s causing it? Thanks

Iain · Accepted Answer

Hi it's a dripping ball valve in the tank

Andrei · Answer

The water level on your water tank is too high. Most likely your ball valve needs replacing or maybe just the diaphragm washer

Ralph · Answer

Needs a new ball valve in the loft in the central heating tank thanks ralph

Peter · Answer

This depends on what the overflow pipe is for, if it is from a water tank then the ball valve could be letting by causing a slight leak and when the boiler is on the level drops below, if the overflow is for the boiler then your pressure relief valance could be faulty causing it to let by

Paul · Answer

Hi you will have 2 tanks in the loft and 1 of them is overfilling due to a faulty inlet valve, not an expensive.

Stanley · Answer

The system will be going over pressure and your PRV is going off. Or it could be a PRV letting by.

Mike · Answer

It sounds like its pumping over through the vent pipe could be a blockage in the feed pipe

David · Answer

cylinder overheating pushing hot water up into tank through vent pipe or cold service to cylinder,or pump over into f and e tank,get a qualified plumber to check it out.

Ricky · Answer

The float inlet valve in the cold water storage tank (normally located in the loft or as high as possible within the property) needs replacing. 
Due to the inlet valve not shutting off as it’s supposed to, the water level is getting too high which is why it’s coming out from the overflow pipe. 
The inlet valve needs to be replaced and that will fix the problem. Hope this helps

Damien · Answer

Expansion cistern is overflowing ball valve needs adjustment should be an easy fix

Overflow pipe dripping

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