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Try turning the power off to the furnace wait 5 minutes then turn it back on. Tell me what happens. What on/off buttons are you referring to?
Ok, but I need to know what the furnace does when you turn the power off then back on again. Dose the small fan on the front start up? does the main blower run?
You can try resetting the rollout switches (see attached picture for a typical one). They are located just outside the burner chamber. First turn the power off then push the small button between the 2 wires. If it clicks you have reset it and the burner will fire up with any luck when you turn the power back on. If it doesn't click it wasn't tripped.
It's just outside the chamber. I suppose in front of is one way to describe it. Look for a device similar to what's in the picture with 2 wires and a small button between the wires
Then it wasn't tripped. Follow the wires connected to it to be sure there are no other similar device(s) in that circuit.
Then that's about all you can do. The next step is to call in a pro