Hasn't this unit have a run timer within the control? I would assume there would a MC contactor ( as the first 3 phase input), then the star/delta change over to run the pump. I also know of a stuck contactor function used as well. I would have thought in the event of this stuck RC, the system would pick up this, and trip the run timer, which would in turn trip a MC contactor. Also you asked about a temp control, there was also a over temp function and was a pain when hydro's were driven past their duty cycles and shut down.
