Thank you, Yuri. The switch I'm describing is the safety limit switch that inactivates the blower fan when the front cover is removed. I suppose this switch powers the 110/24V transformer?
Blower motor cutoff switch hum
I've installed a Heil 90+ percent furnace and when the blower motor cutoff switch is actuated I hear a low humming sound. Is this normal? I should add this is not a cycle startup problem. It simply hums when it is off.
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Beenthere - Thanks - Chip
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