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Hello, one minute while I get some information together.
If you get to the thermostat remove the Green wire from the thermostat and see if the fan stays on, let me know.
OK the relay is stuck on the board then, you will need a new control board then. Replace that and you should be good to go. If it is an older model you could have a bad fan switch, but that would only be on a pretty old unit.
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Call this company with the complete model and serial number to get the correct part.