potterton 28i heating pressure goes low?

will try to help, next time ask question in english. the correct pressure is between 1-1.5 bar cold, depending on size of your system it will go up to 3 bar when hot. if yours goes up to high to fast it could be pressure vessel or it could be safety valve. it could be that you have to much pressure in cold. when asking a question it helps if you name boiler.

spook15
April 2008

yes that one

ron simth
April 2008

do you mean, when say at 1.5 bar cold it goes to 3-4 bar when heating on then when back cold, pressure settles lower than previuos 1.5 bar and requiring to be topped up ???????????????

iain
April 2008