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The furnace starts and has good heat but it whistles and screaches at times unit it has run for several minutes then it stops. I have checked for loose parts or any signs of vibration and can't find anything. do you have any suggestions.
Hi Roger, Whistle... don't know, screech sounds like the motor bearings are bad, or one of the fans is rubbing, since these are the only parts that move in the furnace. Good luck
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