There is no power light or any light at all coming from my furnace, but I hear a sound like it wants to come on, but nothing is happening? What can I do?

Answer

It sounds like you have power to it, but I'd check that first. The hum is likely a transformer if it's a rather soft hum, (not a motor stick hum). I'd check the fuse on the board. It is probably a 3 amp car type fuse. If that is good, I'd check power to and from the transformer, (120v in 24v out). If all that is correct, then I'd be leaning towards the board being bad, but I can't really confirm that without being there.

Updated on April 5, 2018

Original Article:

Troubleshooting Common Furnace Problems With an HVAC Expert
By Dan Robbins
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