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ariston micro combi 23/27 mffi?

water running outside from the safety valve outlet, goes from steady drip to running and doesnt stop. has made an awful mess of the wall. would like to have an idea what is causing problem? before getting an engineer, who can and may tell me anything.
angela, May 2008
can anybody tell me the gas pressure and what it is suppose to be also the water

julie, August 2008
the fact it goes from drip to run (when heating on) expansion vessel required, and new prv.

iain, May 2008
link Click here to see other fixes for Ariston.