We have a G3 Leisure Bay Spa. It started leaking from the union gasket on the pump. We replaced the gasket. Now that the gasket has been replaced the spa will not heat up on its own. If you manually turn the pump on the spa will heat up a couple of degrees, but it only runs a couple of minutes and turns off. The temperature then falls back down. We do not have a manual for this spa. Can someone please help?