Question about Aprilaire 550 Humidifier
Checked the connections where the wires from the transformer connect to the circuit board inside the furnace and don't seem to have power. The furnace is working correctly other than not having power at the "HUM" screws. Is there anything I can try before calling a professional to replace the circuit board inside the furnace?
See if you have a screw marked EAC This to power an Electronic Air Cleaner unlike the HUM it also gets 120VAC only when the fan comes on. Not sure what make of furnace you have but if your heat is working OK don'tn change the control board the can be very expensive. there are other ways to wire humidifiers without using the HUN screw
Posted on Feb 09, 2009
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Posted on Jan 02, 2017
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