I have a Vokera Linea 28. It doesn't hold the water pressure and requires constant re-pressuring. I have checked for leaks at all radiators and cannot find any. Also there isn't any discharge at the vent pipe outside

Jim, January 2008

although expantion vessel may have pressure in it, then cheque the pipe or tube connecting the vessel to the boiler is not blocked, as if this pippe is blocked with sludge then in effect the exp vessel is blocked off and canot operate, when charging the vessel make shure theres nothing in the system acting as a pressure against you, good luck, Eric, whitehouse-apartments, Glasgow.

eric craig eric@ericcraig.wanadoo.co.uk, January 2008

not the pressure vessel! you poss have a leak in system. if cant locate it may be heat exchanger, vokera prone to leaky heat exchangers, never top up system when heating on!

d8vsn, January 2008

Your expansion vessel may be flat, it is worth recharging it to see if it helps, discussed here for example.

http://www.fixed4free.com/answers.php?id=68441

and elsewhere if you search.

The expansion vessel is a largish red container behind the boiler with a car tyre type valve on the top.

c, January 2008