DePressurising a Worcester Highflow 400

[culpitt]

Hi,
I've had a bit of a central heating crisis this evening. I needed to put extra water in the boiler as the pressure had dropped. I opened the valve to let the water in and, after the water went up to 1 bar I shut the valve only to have the flaming thing break in my hand!

By the time I had found a pair of mole grips and emptied out the cupboard and got the stupid thing turned off the pressure was up to 4 bar

1) will running the central heating at 4 bar damage anything or cause a catastrophe?

2) How do I let off the pressure to get it back down to 1 bar?

Thanks for any help you can offer

 

[ollski]

If you take the front panel off just above and to the left of the pump you will see a red knob with 3 bar and an arrow on a sticker on the top. On this valve there is a small grey tap, open that with something to catch the water under it and away you go.....if you don't fancy that just open a radiator bleed and catch it from there.

 

[griggs]

Might be worth getting the pressure relief valve inspected, it should have opened at around the 3bar mark.

To release the excess pressure, open a draincock, or you could do it from a radiator bleed valve, but this could take some time. Relieve the excess pressure before firing up the boiler.