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Fan & Limit Switch broken again

In a year I have had a second white Rodgers fan and limit switch break where the fan won't shutoff no matter how cold the furnace gets. I have a thermopride oil furnace. Limit switch shows 160 when burner running and never gets to high Limit.



    EBEBRATT-Ed Member Posts: 14,473
    edited December 2022
    If the limit is set at 160 that is ok. If the furnace is running at 160 that is not ok. Why did the fan limit break that is unusual
  • johntrhodes81
    johntrhodes81 Member Posts: 37
    Both the times the fan part of the switch would stop working so the fan would never shut off. The burner limit works fine.

  • Jamie Hall
    Jamie Hall Member Posts: 22,073
    Is there anything else connected to the fan limit? I've seen switches do that when they are carrying too much current, or a large motor load.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • pecmsg
    pecmsg Member Posts: 4,377
    What is the actual temperature rise?

    Amperage on the switch?

    CFM's on the blower?
  • johntrhodes81
    johntrhodes81 Member Posts: 37
    The auto / manual stick keeps popping loose so the fan won't shut off.