I repressurised my Worcester 24si boiler, to 3 by mistake

[jeanette63]

I normally let it rise to 1.5 or. 2, I accidentally let it go to 3. Is it safe to switch on?

 

[DomHeating123]

No it is not safe, boiler pressure is way too high. You can remove some of the pressure by opening an air vent on a radiator and catching the water in a bag/tub. Open vent let some water out, close vent and check pressure, repeat till 1.2/1.5 bar reached. Could also let some pressure out the relief valve but sometimes valve doesn't seat properly and can pass.

 

[terryplumb]

You can use the radiators air bleed valves to reduce the pressure .big towel to catch the water !!!. If your boiler pressure is 3 bar when cold ,and you turn on the central heating , the pressure will rise as water heats and expands ,and your pressure relief valve will open. So you should reduce the system pressure to 1 bar before running the boiler / central heating.

 

[terryplumb]

Snap !!!

 

[Jackrae]

Also note that if the pressure falls after only a little amount of water has been removed then your expansion vessel may be faulty.