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Discussion Starter · #1 · (Edited)
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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Discussion Starter · #3 ·
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?
 

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Blower access panel safety switch.

Your hearing the low voltage transformer.
 
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