Home Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Interesting. I would not expect a switch closure to cause a pop.

Electrical noise usually comes from interrupting current that is already flowing, because of the circuit inductance. If you get a pop in your audio system when the blower starts, then perhaps the plenum switch is faulty.

Does your furnace have a digital control that operates the blower? Have you tried a line filter on the AC supply to the furnace?


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