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Ok, an ROL error is a rollout not a hi limit error. The rollout sensor (see attached pic) is located just above and out side the burner chamber. You can't reset it. If it trip it has to be replaced. You can confirm it's the sensor and not a bad board or a bad connection by first turning off the power to the unit then connecting the 2 leads on the sensor together then turn the power back on. If i fires up you need to replace the sensor.