please could some one help me with potterton 28i boiler heating pressure goes low, when filled 2.0 then goes to over 3.5

ron smith, April 2008

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