Boiler pressure gauage is too how. Help! How to get it to normal.

HappySad

Our hotwater and central heating combi boiler is over/high the limit for the pressure and is in the red. Usually when it is below pressure we turn on a tap underneath the boiler and this moves the needle back to normal setting.

This time it is the opposite and is too high. Outside we can see that there is water dripping out of the outlet pipe from the boiler. But the boiler is still high in pressure. Before when this happened the boiler later went mad and made loud banging sounds.

What can we do... Help!! :mad:

Browntoa

there should be a drain valve somewhere on the system probably below the boiler going out through the wall ?? open that and it will reduce the pressure

or there may be one on a radiator

otherwise opened a bleed valve on the nearest radiator and wait until the pressure drops to normal , have a cloth/bowl handy to catch the escaping water

macman

Bleed some water out of a rad to reduce the pressure.
Sounds like the filling loop valve is not closing properly and it's continuing to pressurise it when seemingly closed. That's why it's escaping via the pressure relief valve. Easy enough to change the loop or clean the valve. You can disconnect the loop as a temporary measure.

roger196

macman wrote: »

Bleed some water out of a rad to reduce the pressure.
Sounds like the filling loop valve is not closing properly and it's continuing to pressurise it when seemingly closed. That's why it's escaping via the pressure relief valve. Easy enough to change the loop or clean the valve. You can disconnect the loop as a temporary measure.

The filling loop is meant to be disconnected, other than when topping up, to comply with water regulations.

ormus

only on some boilers and in some water board areas.
my vaillant combi has a permanent filling loop connected. with two valves. topping up is a simple job.

macman

As does mine.

muckybutt

roger196 wrote: »

The filling loop is meant to be disconnected, other than when topping up, to comply with water regulations.

No need if you have one of these ! http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=7118460

Canucklehead

muckybutt wrote: »

No need if you have one of these ! http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=7118460

Hi,

Ever heard of the expression 'Shoot yourself in the foot' ?

Have a read of the PDF in the link,


GSR.

keystone

OP once you have got your pressure sorted out and stopped the filling loop passing then you need to get the PRV checked. Once they lift once they get full of carp and frequently do not reseat properly so that they then start permanently passing.

Cheers

HappySad

Thanks everyone. My partner will have a look at it and follow instructions given. Cheers :0)