Boiler pressure

50Twuncle

We have just run our CH boiler (a 15 year old Worcester combi) for the first time this "colder season"
It needed topping up - my wife may have put a bit too much water in (to about 1.5 bar)
Anyway - when run - it fairly quickly went up to almost 3 bar (red starts at 3 bar)
Should we be concerned and how do we remove water and hence reduce the max pressure ?
I believe that the cause is the pressure vessel needing re-pressurising ?
I have tried to book a heating engineer but am unable to for over a month !!!

stator

You can reduce the pressure by bleeding your radiators. Just get a key (or buy one from a DIY store) and let some water out the top of your radiators. (if air comes out, they needed bleeding anyway) The pressure will go down.

Alex1983

A short term solution is to shut one end of a radiator off and half drain that radiator. It will act as an expansion vessel, this will buy you a bit of time until you can get a heating engineer to recharge the boilers internal expansion vessel.

bobbymotors

Alex1983 wrote: »

A short term solution is to shut one end of a radiator off and half drain that radiator. It will act as an expansion vessel, this will buy you a bit of time until you can get a heating engineer to recharge the boilers internal expansion vessel.

what a brilliant idea

50Twuncle

What would happen if we do nothing ?
Will the boiler expel excess water or explode ?

Alex1983

The boiler should dump the extra pressure out the pressure relief valve, you will then lose pressure and need to top back up. It would be likely you will need to replace the pressure relief valve as once it opens it will probably not close and continue to drip water.