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Not a HVAC expert, but have done my fair share, had a problem years ago with with a Carrier Infinity 98, I turned the breaker off and when it went back on the motor would not run, fault code indicated motor failure, still under warranty service rep arrived did a quick test and replaced the wall mounted controller. That controller is where you set the speed for the motor. Any chance the wall mounted controller is not set up or working properly?
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87 930,
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