When cold pressure 1bar rises to 3bar when hot, in the morning no pressure, if cold and pressure at 1bar leave overnight there is no pressure drop.

Any advice.

Cheers

Taza, October 2008

if it rises when using your heating, its expansion vessel.

vessel has either lost its air charge or has split and air section is now full of water giving no free room for expansion.

vessel on back of boiler has tyre type valve, remove cap push pin in briefly:

if you get.....
air: maybe needs a bit more charge
nothing: needs charged
water: f*ck*d

iain, October 2008