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Central heating system Pitching problem

  • 19-10-2016 4:43pm
    #1
    seamus1980
    Registered Users, Registered Users 2 Posts: 487 ✭✭


    Hey guys,I have a problem with pitching,We have a back boiler and a oil boiler.The plumbing has been done for many many years.We changed the boiler and put in a second hand one 1 year ago but havent used it until today.I went up to the attic and have seen that the plumber put a expansion vessel on the return above the cylinder.The weard thing is that when i fire up the oil boiler after 15 minutes or so the expansion pipe from the back boiler starts pitching(back boiler not lit).I am totally lost on how the oil boiler is making the back boiler vent pipe pitch.Also when i open the relief valve one the oil boiler with mains feed of the oil boiler is emptying the header tank of the back boiler:confused:,Why would this be happening totally lost as his plumbing is all over the place.Any info would be great


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