Report Cal Spa 2000 - Heat Light Is On Only When Jets On Are High in Portable Hot Tubs & Spas Posted October 8, 2014 Sadly, I never did solve this particular problem and have had the spa run-but-never-heat for Winter 2012 and just drained it for Winter 2013. Unfortunately, some water managed to get in and I didn't discover until far too late that the cover was broken. It re-froze (ah, Michigan) and I have some leaks... well, somewhere. I tried looking for them manually but I didn't want to tear the foam out. I tried some goop that runs through the system and seals small holes. That worked, but not for long. The slightest pressure or just warmer water ended that. So, even though I bought a nice new cover, it remains unusable unless I'm willing to top off the last foot or two every few weeks. Of course, running it over the winter is just not going to happen until I can find and fix the leaks. All I know for certain is it is not around the pump area and it only leaks/drains to a certain point and stops (just below the level of about 6 jets). I'll try to keep it from being damaged further this winter and it'll be a project for me next spring.