Furnace problem- expansion valve leak

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Hurley, Nov 6, 2004.

  1. Hurley

    Hurley New Member

    Nov 6, 2004
    I have an H.B. Smith & Co. furnace that is pretty old. Last year, our expansion valve was leaking water behind the furnace. Our oil dealer came in and drained the expansion tank and replaced the expansion valve. It has lasted almost a year, but now with the cold weather coming, the furnace is working more, and it is leaking again. The expansion tank was full again, and I drained it myself, but the valve is still leaking. Any advice?
  2. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    The logical assumption is that you did not drain it properly. The long term solution might be a "precharged" expansion tank, but if so, then you may have to make other arrangements for any air evacuation devices which may have been installed to divert air into your existing tank.
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