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no leak but boiler losing pressure daily?

What couold be the problem other than leak, which we do not have, i have a vokera compact 25a fitted 2 years 10 months ago recently started losing pressure every month now down to every day
pamela robson, December 2013
Your expansion vessel needs charged to 1bar then check the prv pipe for drips outside

g, December 2013
http://www.youtube.com/watch?v=uPPUPftBI58

Q, December 2013
link Click here to see other fixes for Vokera.