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When my heater starts up it will light and run for approximately 5 minutes and then it trips a limit switch, will not relight until I reset switch. What's causing switch to trip?

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    Too many things to guess. But before giving up, can you please add to your question: Manufacturer & model # of furnace. Assuming it is forced air, do you get air blowing out the ducts in those 5 minutes, and if so is it warm or cold? Have you cleaned the filter(s) lately? – manassehkatz-Moving 2 Codidact Dec 22 '19 at 4:12

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