Boiler Pressure

[lutkie92]

Hello, hoping you knowledgeable people can help. Are boiler pressure has shot up to 3.5 this morning and sometimes goes to 3.8. Usually it stays between 2-3 and im worried its not good, please help xx

[BRIGHT SPARK]

Generally the cold pressure would be around 1.5 bar rising to 2 bar when hot.The fluctuations you describe may need investigation depending on the boiler.Contact the installer.

[deggers316]

my boiler is 1.5 cold when running hot water it can go up to 9.0+,no problems

[The Builder]

Sounds like the pressure valve/regulator, lutkie.
You do need to get someone in.

[BRIGHT SPARK]

deggers..we are talking about the pressure within the domestic central heating system .If yours was running at 9 bar the prv's would be quite audible....

[Bob906]

Usually the boiler has a gauge showing the pressure and is coloured low1 red green middle and high 3 red if the needle goes significantly into the high red you don’t have to worry too much because the relief valve will release any over pressure.
I had the same problem and I called the engineer out and that’s what he told me.