Question about Superior Lennox Blower Thermal Sensor - BTS

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My outside ac unit seems to have a low voltage hum coming from it. The ac unit works fine. I turned the thermostat off in the house and it stopped. Is this a problem? Is it sucking electricity the entire time I thought it was off? We usually have it set to auto on ac and fan.

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That is most likely the control transformer - it drops the 240vac to 24vac for the thermostat, and the run contactors. The transformer may have a loose lamination - not a problem, unless you are bothered by the noise.

Posted on Apr 23, 2010

Testimonial: "Thanks for your help kinda of worried since we live in Arizona and it's about to get hot!!!!"

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Try spinning the fan by hand. If it moves freely replace the capacitor, if not replace the motor.



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