My Sabre HE condensing combi boiler keeps cutting out so I have no heating or hot water. I have to keep pushing water through to increase the pressure and restart it to fire the boiler up. I am doing this daily now, so I sat and watched the boiler for 30 mins after restarting it and saw the needle slowly reduce to zero. I cannot find any leaks and have called two engineers out who have not solved the problem despite replacing the actuator and diverter valve. Any suggestions please.

A very chilly pensioner, May 2015

Good adivce Q

bob, May 2015

''boiler keeps cutting out because it keeps losing pressure''

''boiler loses pressure within 30 minutes''

you must have a MAJOR leak SOMEWHERE

on a combi boiler system there are only 4 places where a leak can occur

1. the boiler [either internally or externally]

2. the radiators

3. the visible heating pipework including the safety blowoff pipe

4. the UNSEEN heating pipework [which is normally hidden from view because it runs UNDER THE FLOORBOARDS or IN THE CEILING or INSIDE THE WALLS or BURIED IN CONCRETE]

fixing a leak is easy

FINDING a leak is a nightmare

you should be capable of checking the following

1. external leaks on boiler
2. leaks of radiators
3. leaks on visible heating pipework including safety blowoff pipe

you would need a professional to check

1. internal leaks in boiler
2. leaks on unseen heating pipework

as you have had two engineers out already

and they have replaced parts on the boiler

and it has made no difference to the boiler continuously losing pressure

I get the impression the ''leak'' is somewhere on the system not the boiler

Q, May 2015

Check that there is no water discharging outside from boiler pressure relief valve

toptrish, May 2015