Boiler pressure drop...unusual 'leak'

marc888

Hi,


Hope someone can help. Have a two year old Worcester Bosch boiler that is losing pressure.


Had WB come out and replace PRV under warranty but still got pressure drop.


However outside there are TWO overflows from the boiler....one copper pipe from the PRV and one white plastic from somewhere else within the boiler. When the system is cold / not under pressure and (heating and water off) and pressure is topped up to around 1.5 bar the pressure drops slowly to zero over around a three hour period with no visible water from the overflow outside. However if I then turn the heating and water on after around 10 to 15 minutes water can be seen gushing out of PLASTIC overflow and then stops. Then again after around 10 to 15 minutes it happens again. Anyone any idea what this problem is ? Faulty / split expansion tank ? Faulty / split heat exchanger ?


Thanks in advance

malky39

The white plastic pipe will be the condesate discharge pipe as should not just terminate out the wall. It should terminate into a waste pipe or purpose made soakaway.

missile

marc888 wrote: »

When the system is cold / not under pressure and (heating and water off) and pressure is topped up to around 1.5 bar the pressure drops slowly to zero over around a three hour period with no visible water from the overflow outside.

Pressure should not fall that quickly. Have you bled radiators and checked for leaks?

It would appear the engineer did not fix the issue and I would complain to WB.