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First thing to check is the rollout switch(es) (see attached for typical)which are just outside the burner chamber. Turn the power off to the unit then push the small button between the 2 wires. If it clicks you have reset it. If it doesn't click it wasn't tripped. Then turn the power back on. It will fire up with any luck if it was tripped.
It's just outside where the burners are. If there is a box enclosing the burners it will be on the side or the top of the box
Then you need to press the reset on all of them.
Then you probably have another opem limit in the circuit. Do you have a multi-meter?
Also try turning thepower back on anyway and see what happens
Then you need to trace the 2 wires connected to the rollouts back to the control board and test for continuity across those 2 leads at the board.
It means you have an open limit device/switch in that circuit that has the rollouts as well. The next step is the continuity test I outlined above if you want to diagnose this further.
You need to trace the 2 wires connected to the rollouts back to the control board and test for continuity across those 2 leads at the board.
You can also test for continuity across any device you come across in that circuit. Be sure the power is off before you test this way