My baxi combi 80e loses pressure from the pressure release valve when the central heating is on. when cold the pressure is about 1 bar, rising to about 2 when heating but then after central heating switches off and cools down all the pressure goes and i notice water running out of the relase pipe. then i have to re-pressurise to about 1 otherwise the boiler makes lots of noise then goes to lock-out.

stephen titcomb, March 2007

my bolier is losing pressure but there is no signs of water

steve hocking, October 2011

expansion vessel needs checking, may need recharging or its split.

hi-spec plumbing, March 2007