Home Forums General Discussion Technical Questions Otis 211 STLD fault

Hello,
We have an Otis 211 that we are getting intermittent STLD faults. Once we get to the site and reset it it will run for a couple of days or week then get another STLD fault. We have looked at some of the obvious things such as slowdowns, interlocks, valve(new)and selector. It is so intermittent we cannot nail down the actual cause. I ran the unit to every floor for 2 hrs with no hickups or issues. Does anyone have any suggestions.

Thanks