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My code states that I have a faulty limit swicth?? How do I test limit switch?? Can I reset the fault?? :confused:

Thnaks found switch. I removed it and tapped it against the floor . I reinstalled it and furnace I now OK. I will buy a replacement switch just to be safe.Thanks

My Trane furnace which is 2 years old just started blinkind 4 times meaning open limit device. I replaced filter but still keeps flashing.

Is there any way to reset the fault??

How do I test...