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Hi, I hope someone can clarify if i've worked out the correct understand of how a motorised actuator works: I suspect i have a wiring problem with my 3port actuator: Myson MPE322-3 port 22mm Spring Return Valve on a y-plan system. I would like to ask your advice so I can contact a plumber or...

Help! Recently i had a problem with the Potterton motorised valve (type MPE322 - 3port) fitted in my central heating system. The hot water would work OK but the valve would not motor open to switch on the central heating...........SO.......I replaced the actuator with the identical model...