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.
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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