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Many thanks to you Dave for your assistance the other day with my worcester bosch 30 si.(pressure dropping) After finding 1 litre of water had come from the safety discharge / prv I called my plumber. He said it sounds like the expansion tank had failed and told me to call worcester...

:D Hello and help please lol! I have a worcester bosch 30 si. it was fitted in nov 06 along with 1 new rad piped to a ground floor extension and fed from an upstairs rad. System piped in 15mm and microbore. I 1st noticed a leak from the new rad which turned out to be an o ring on...