I have a Hot Springs Classic model F (1996). I noticed a problem some time ago where the power LED was flashing so I turned it all off and left if for the summer. I am now trying to get it going and think I have found the problem. I have read several threads on this forum and have come to the conclusion that the thermostat may be faulty. With the jets on and only the circulating pump running I can not hear a clicking sound when I move the thermostat from cold to hot. The water is cold but all else seems to be OK. The LED no longer flashes. My questions is "where is the thermostat located that I need to replace The owners manual is not that descriptive