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I have a trane xr 11. The air handler runs all the time even when the unit is shut down. I have to throw the breaker at it air handler to turn it off. Is this a relay problem and if so where is the location of this relay. Ive been told it is located in the outside unit itself. I could use some help on this...Thanks
 

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likely a relay or short in the t-stat wiring.

relay likely on a fan control board or even if a heat sequencer if trane uses them.
 

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Open the blower compartment and find control board the relay will be on the board. Can't find anything on " Trane XR11". What's the model number?
 
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