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Blower motor cutoff switch hum

1947 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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What is a blower motor cutoff switch? Switch to isolate the low speed? You may be hearing the 110/24 volt transformer humming and that is not a problem. If the customer objects then get a new one from ICP under warranty.
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