After changing a few relays, the heating light still would not come on. I always turn the pumps on a few hours a day just to keep the water filtered, but this time after about 4 hours, the water felt warmer. I let it run overnight and now it seems to be hot. The heating light still doesn't come on, but I don't care at this point. If anyone has any tips to pass along, I'd REALLY appreciate it. Thanks!