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    rmattisonrobert's Avatar
    rmattisonrobert Posts: 1, Reputation: 1
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    #1

    Mar 20, 2011, 01:32 PM
    23 year old carrier furnace commes on for 3 minutes then shuts off
    The furnace will light and run normally for 3 minutes then shut off, will try to relight but shuts right off, filters have been cleaned, limit switches and t/stat were temporarily bypassed but had no change on the operation, still shuts off.
    cdad's Avatar
    cdad Posts: 12,700, Reputation: 1438
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    #2

    Mar 20, 2011, 02:17 PM

    Have you checked the relays in the system and the contact tips if it has them. Sometimes a coil will work when cold but overheats when in use (under load) because it gets too hot and loses its field.
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