Every Sunday, I run all my non-essential pumps and the heater (spa only) for about 30 minutes, just to make sure they work properly and as a means to avoid critters nesting where they don't need to. Eventhough the heater li up and warmed the spa to the temperature set, i did note the "service heater" light turn on, and then off. The unit fires up and holds for about a munute or so, service light goes on, units stops, service light goes off, and then it starts again. Before i start dissassembling the unit, has anybody had thecsame symptoms as mine? If so, how did you fix it.