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Trane xc95 furnace with trane 3 wire thermostat. fan runs continuously

Trane xc95 furnace with trane 3 wire thermostat. fan runs continuously

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Old 10-11-17, 07:10 PM
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Join Date: Oct 2011
Location: usa
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Trane xc95 furnace with trane 3 wire thermostat. fan runs continuously

I've gone through the installer set up in the thermostat and do not see any setting for turning fan on to run all the time. on the front of the thermostat you have 3 modes in upper left for the fan and they are ---on---auto----circ. I can highlight the "on" or the "circ" but when I try to highlight the "auto" it always keeps the "on" up so that "auto" and "on" are highlighted. I've turned the fan speed down to 25% but it will not shut off.
Does anyone know if this could be a thermostat issue? there are no trouble codes in the diagnostic board.
thanks
 
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