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Fan & Limit Switch broken again

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johntrhodes81
johntrhodes81 Member Posts: 42
in Thermostats and Controls
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.

Thoughts?
John

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  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,534
    edited December 2022
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    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: 42
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    Both the times the fan part of the switch would stop working so the fan would never shut off. The burner limit works fine.
    John


  • Jamie Hall
    Jamie Hall Member Posts: 23,317
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    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: 4,854
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    What is the actual temperature rise?

    Amperage on the switch?

    CFM's on the blower?
  • johntrhodes81
    johntrhodes81 Member Posts: 42
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    The auto / manual stick keeps popping loose so the fan won't shut off.

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