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Blower motor cutoff switch hum

1945 Views 4 Replies 3 Participants Last post by  highdesert
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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Blower access panel safety switch.

Your hearing the low voltage transformer.
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