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So the limit switch was the issue.
The tech came in and fixed this for me.

All you have to do is follow your circuit chart to find the limit switch, mine was screwed in flush to the metal vents....

Hi, same issue here Trane XR80 4 flashing light.

My thermostat signals the system and the motor starts blowing air, then the light starts doing the 4 flashes while to fan blows non-stop, not...