The receiver is set to CD or AUX. Noise happens on both.
I haven't been able to run to the volume knob in time, but I listen to different things at different volumes and when I'm blasting something, the noise says the same.
Here's another wrinkle- It doesn't happen every time. One out of 20 times the noise doesn't happen.
I tried a noise filter at the j box closest to the furnace. Maybe I should wire it inline with the igniter. I don't have to worry about a warranty- the furnace is 60 years old.
