why do i have to top up my greenstar boiler every few weeks . i cant see any leaks or any water coming out of expansion pipes. and im not sure this is damaging the boiler. thanks steve

steve r, September 2008

Hmm.

It *could*, and it's a very slim *could*, be a boiler fault.

Pressurise the boiler to 2 bar, then isolate it using the valves beneath the boiler. YOU WILL NOT BE ABLE TO USE THE BOILER LIKE THIS so turn it off on the mains power to prevent anyone accidentally firing it for hot water.

If you then leave it like this overnight, check the pressure in the morning. If it has dropped, you have a fault on the boiler - possibly a hairline crack in the main heat cell (which may be covered under warranty). You may also notice water coming out of the condense drain even though the boiler's off.

If the pressure stayed the same, you have a leak somewhere on your system. Prove it by opening up the isolation valves again, if the pressure then drops it's a dead cert that there's a system leak somewhere.

BunSlinger, September 2008

Most likely you do have a leak, it will be tiny as takes so long to lose pressure.Best to turn system off and put pressure to 2.5 bar, easier to find leaks on cold system, check carefully for leak.Dont forget to reduce pressure back to 1 bar cold via drain point when your done.

Hobhead, September 2008