I have a sandiair durval combi boiler THEMA CONDENS F30E and the overflow is leaking. The pressure on the boiler is between 1 & 1.5 bars Any suggestions of how to stop it from leaking?

Jeana, January 2011

turn power off the boiler, then release the pressure off the water with the pressure relief valve. look in the boiler manual where the components are. should see more water coming out the overflow pipe, and the gage should drop to 0. then check the expansion tank with a tyre gage should be 1 bar pressure on most combis if its not put air back in with a bike pump check manufacturers instructions for technikal data. then fill boiler again with filling loop and gage should go up to around 1.5 bar in the green. turn boiler back on and should do the trick ;0)

Andy, January 2011

british gas engineer came to my boiler when doing that, an top of boiler at back there is like a tyre valve he just got a pump an pump air into it

ross, January 2011