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A 33 error is an open limit circuit. The only thing you can reset is the rollout switch (see attached pic for typical) which is just above and outside the burner chamber. Turn the power off then try pushing the small button between the 2 wires. If it clicks you have reset it and the burner should fire up with any luck once you turn the power back on. If it doesn't click it wasn't tripped. Beyond that all you can do is check for loose connections along the wire that's connected to the rollout.