So might be a puzzling question here. I attached a video. Info... I have an M80 wood burning (and electric) forced air furnace. It makes a banging/ringing noise when trying to come on. Had furnace guy here 4 times, changed relays, and thermostat twice, checked wiring, and also had to replace fan motor cause it burned the copper coil/wires ruining fan motor. Other wires have also burned and melted, having to replace them. The thing is electric works just fine, comes on every time no problem. When wood is trying to come on it thrashes, rings and sounds like someone inside beating on it until it finally kicks in. I could not load full video to show this, file is to big. I am not trying to run wood and electric at same time, fire is hot. Unit is 24 yrs old. Wall thermostats are a couple years old but seem to work fine clicking on and off when temperature is turned up or down. Damper also is working fine. The only thing I have not changed is the transformer. Could it cause this. Do you think I got two seperate faulty thermostats? So frustrated. Ideas would be so appreciated. Furnace guys said they never heard this noise before and can't figure it out. Of course while they are here and a new fire is put on it kicks on and off fine, hence the video to show them. Thanks!
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