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potterton 80 heating system?

i have a potterton 80 heating system when the heating is on the pressure gauge always goes into the red 3-4 bar & somtimes sends water out of the pressure release valve even tho when the heating is off & the system is cold is sits on 1bar could anyone tell me how i can get this sorted out

gordon
July 2007
sounds like a faulty expansion vessel. needs recharging or is split.
get an engineer to check it.

hi-spec plumbing
July 2007
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