Here's an odd one that I havent been to resolve so far. No one seems to know the answer or have ever heard of this errorwithout a corresponding mechanical failure or configuration error. It is detailed in the IOM as being exactly what it describes. My Intellipak is a SFHFC755HV77C and I have a constant Automatic reset diagnostic of "Unocc Cool Setpoint Fail""Unocc Heat Setpoint Fail" I've been doing what I consider to be a thorough job of maintaining the units and over the years have seen my share of faults where one failing component precipitates an error message for something unrelated. This does not seem to be the case here, I have been all through the programming and configuration. The units is configured the same as the other five on the roof and this is the only diagnostic that I have not been able to root out. It has survived a bcu replacement and tracer upgrades both of which required me to review the configuration thoroughly. Custom programming is minimal. It causes no problems, the unit maintains temperatures day and night but it irks me to see it year after year. Any ideas?