I've search the forum and have not found this particular problem, but it does appear that other users are having issues with this same pump. In April 2010, I installed an IntelliFlo VS-3050 to replaced a burned out Pentair 1.5 HP single speed pump. I've been happy with the pump overall, especially the huge savings in my electric bill. When I replaced it, I wired it into the existing mechanical timer that was running the old single speed pump. Up until recently, I have not had any issues. About a month ago, I noticed a few times that the pump was not running. When I checked the pump, it was powered on, but the motor was not running, so I would just manually restart it by pressing the Start button, but never figured out why it wasn't running.
Now, this past week, I've noticed almost every morning, when the pump turns on, it comes up in some unknown state, running at a slower speed than the normal Speed 2 setting where I leave it. I can tell because one of my water features is dribbling over the edge of the pool instead of shooting in to the pool as it should. I have to manually go out and press the Stop button, then press Start again (it usually won't respond to pressing a different speed button until I Stop, then Restart). On 2 separate occasions, it turned on in the lower speed with the LED flashing an error code that indicated "Excessive Drive Temperature", which I found hard to believe when the pump had only been on for about 2 minutes and the ambient temperature was about 40 degrees (yeah, it gets cold here in Florida sometimes).
So I called Pentair tech support and they told me that my timer is probably not turning off both poles at the same time, which could be causing the problem, and told me I should be controlling it with an automation system ($600 - $1000!!!). But according to the manual, my setup should be perfectly acceptable. Does this sound reasonable, since I've been running trouble free on this timer since April? Anyone else seen this type of behavior with the VS 3050? Thanks for your inputs.