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This is indicative of a burned thermistor in the motor end bell. Generally this is only resolved by replacing end bell or motor.
You have eliminated the motor as a cause, that leaves only the printed circuit card or the ECM motor driver. Look over the link below and tell me which one your system uses.
We can go from there.
If you do not have a variable speed wall switch or a two speed wall switch, and just the Tekelek controller by itself, then the odds are nearly 100% that the Tekelek 297 has failed.
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Tell me if you have a multi meter to check the resistance changes out of the wall switch controller as you change the setting from off to high speed slowly... if the controller is good it will change from infinite ohms when set to OFF, and increasing ohms as you gradually change the speed setting.
You can buy a $30 ohm meter to do that if you like at all hardware stores.
If that checks out OK we need to replace the 297 unit.
If the variable speed controller does not provide a gradual change in resistance as you move the setting from OFF to high speed, then all you need is a new variable speed wall switch/controller.
Good question. A bad speed control will probably not cause the motor to turn the wrong way, but it is the least expensive of the parts involved, and is worth eliminating as the cause even if the probabilities are low.
The wall switch speed controller is most likely OK in this case, that leaves the larger 297 module as the only remaining suspect.
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