S Davis wrote:
Have the electrical connections been checked/cleaned, a grounding issue could cause those symptoms. Also when you replaced the burner did you make sure the igniter gap was set correctly? If too far you can get intermittent or no spark on some equipment.
We just replaced our converter after I spent a month troubleshooting and hunting down weird electrical issues we were having. We tried a bunch of things before going for full replacement. We went to clean the ground nut where it attached to the frame and it was so rusted it just broke off. Typical. So we have a clean and shiny new ground post attached to the frame and we followed everything back to check that it was all good. So, I'm pretty sure that is not it.
The new converter is amazing, btw. It's so much quieter, runs a lot cooler, and it won't keep burning out our LED lights every year. The replacement was easy and well worth it.
But it looks like furnace replacement is a Lot more expensive and a bigger hassle, and I don't want to do that. I'll go after the ignitor and hope that does the trick, then do the control board next. Still beats the $700 they want for a new furnace.