I do not have enough time to list the possible reasons this light is on! There is a reset procedure but it is in the owners manual, I dont know ,nor does anyone else, why the light is on. We can guess at it all day long and be wasting time. Try holding the tripodometer button in turn key on do not release button until light flashes, if it remains on get a shop to see why!! If you have owned it since 2007 you surely should have the OWNERS MANUAL, Good luck with your problem.