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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> problem with my boiler https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1289897975 Message started by georgeboy on Nov 16^th, 2010, 8:59am

Title: problem with my boiler
Post by georgeboy on Nov 16^th, 2010, 8:59am

Hi can anyone help me please with my combi 80 Eco boiler the problem is the pressure was low so I let more water in now when I turn on boiler the pressure goes up to 4 bar which is in the red area is this a danger & how do I lower the pressure again [IE can I let the extra water out & if so how ]thanks

Title: Re: problem with my boiler
Post by cumbriahandyman on Nov 16^th, 2010, 1:43pm

Bleeding your radiators might be all that is required to lower the pressure. Failing that, you might have a tap on the side of the unit through which you can let out some water.

If that is not the case, do you have a tap on one of your radiators?

Title: Re: problem with my boiler
Post by thescruff on Nov 16^th, 2010, 3:07pm

I think the real issue is why the pressure goes so high when the boiler is on, and more importantly why the pressure relief valve (safety valve) hasn't opened at 3bar.

The expansion vessel pre-charge needs checking and sorting if duff.