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My gas furnace will ignite, but after the pilot goes on for a moment it creates a large periodic knocking sound over and over again instead of the fan starting. I have my suspicions, but I wanted to ask if anyone has run across this before.

Here is a link to the startup sequence https://youtu.be/K2jNJ1Abh20

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    Hello, and welcome to Home Improvement. Sounds like a relay bouncing to me, but let's see if one of our pros gives a more definitive answer. And, you should probably take our tour so you'll know how best to participate here. – Daniel Griscom Jan 15 at 1:36
  • The large buzz sounds like relay chatter to me also+ is your igniter always striking? I think that was the other noise I could hear a dirty eye could cause that but I don’t see one in the photo.+ – Ed Beal Jan 15 at 18:15
  • It turned out to be the inducer motor. I replaced the complete inducer kit and we are working fine. – Chris Black Jan 17 at 5:34

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