Combi boiler pressure too high, please help!

LeLLe

Hiya,
My combi boiler loses pressure every so often so i topped it up, however my hand slipped n it shot up more than i wanted it too. I've turned the boiler off as i'm a bit worried now lol.
Will bleeding the rads release the extra pressure?
Thanks in advance x

Plumbers_Shop_Lee

Bleeding the rads will is the quickest way to solve your problem although the boiler is designed to deal with this itself should the pressure get too high

Hth

LeLLe

Ok, thanks very much for the advice.

feilim

I am having problems with boiler and radiators. The boiler pressure sat at zero for ages and the radiators would only come on if temperature was up full. This led to radiators too warm. The last time the gas engineer was out he tried to solve this and said to connect the filing loop back on and turn the gauge with pliers slightly. I done this and the pressure has went too high now. The heating still only works at a high temperature. Difference now is that the pressure is too high (at about 3) and I dont want it overflowing again and flooding my neighbour below. So basically how do I fix this to get my boiler working that I can choose the temperature of the radiators and the pressure comes down as well?

macman

Welcome to the forum. Bleed from any rad to reduce the pressure to around 1 bar.
It's a sealed system, it can't overflow except via the PRV, which should not drain into your neighbour's flat! It should vent through an outside wall.
PS: it's better if you open a new thread than dig up one that's more than 2 years old.

50Twuncle

We had a similar problem last year and this was due to the expansion vessel springing a leak - our pressure went up to 3.5 without any signs of any pressure relief valve "blowing" the excess pressure
Eventually - I chickened out and cut the power
This is a Worcester combi boiler