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Lennox pulse furnace of 1986 won' stop running

I have replaced several parts on this furnace and now it won't stop running


  • Knorton101456
    Knorton101456 Member Posts: 2
    Help my electric bill wi be out of site, not to mention the stress on the furnance
  • John Mills_5
    John Mills_5 Member Posts: 946
    Actually better for constant fan than cycling on the motor! Yes, it could add $20-30 to the monthly juice bill. A tech would know right where to look for the problem. Probably should have an authorized Lennox dealer to a pressure test on that relic to be sure the heat exchanger is safe.
  • Tinman
    Tinman Member Posts: 2,804
    I remember having trouble keeping them running in the early 80's.
    Steve Minnich
  • RobG
    RobG Member Posts: 1,850
    I don't do air, but if they are anything like pulse boilers, if the gas doesn't shut off, it won't shut off. Just like a diesel engine. They operate on latent heat ignition.
  • Spence
    Spence Member Posts: 316
    Is it only the fan that keeps running?
  • Patchogue Phil_2
    Patchogue Phil_2 Member Posts: 304
    After 6 days, the OP either solved the problem elsewhere or he "cooked" his whole house with runaway heat.
  • Spence
    Spence Member Posts: 316
    Glad you have an accurate pulse on this one.