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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

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December 2013

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