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Lennox Pulse Furnace

devoldevol Posts: 1Member
The furnace operated flawlessly on LP. Just converted to natural gas. Now it fires up but runs for only 10 minutes and shuts down. I have to recycle the power to get it to fire up again. It takes 2-3 times cycling before it starts again and runs again for only 10 minutes. Gas pressure OK, spark plug OK. Any help????

Comments

  • unclejohnunclejohn Posts: 1,420Member
    Why is it shutting down, hi limit flame fail?
  • Brp814Brp814 Posts: 22Member
    You mention the spark plug, but have you checked the flame sensor? Probably needs to be replaced.
  • JohnLappeJohnLappe Posts: 8Member
    Also make sure your intake and exhaust terminations are not blocked and check condensate drain, I worked on a lot of Pulse Furnaces and ran into these issues regularly, make sure you have the proper gas pressure also, when the furnace runs, is it smooth?
  • GWGW Posts: 3,445Member
    Kinda curious, Lennox got you the parts to convert that beast? This must be a friend or relative job!
    I'd start scoping the air switch, goo in condensate, measure micro amp on startup and see if it's different 9 minutes later, presure test the hx, change the flapper. Jump r w,
    If all that fails throw a new control at it. If that doesn't work, I'd start with a new furnace
    Gw
    Gary Wilson
    Wilson Services, Inc
    Northampton, MA
    www.wilsonph.com
    [email protected]
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