Smattern85

Hey all this is my first post with this forum so im hoping you can help me. I have a Cal spa cs5000 and i have just replaced all the jet covers and was hoping to fire up the spa after about a year or so, well I turned it on and left for dinner hoping that when i returned it would be a warm enough for me to sit in. When i got home the spa temp had gone from 72-77. The next morning i was so sure that i would be able to hop in the spa, but it was still only 77. I have checked left and right on this thing but im affraid i just dont understand this system. I have flipped the breaker switch a couple of times hoping to reset the system but nothing happened. I also noticed that the Heat light was not on. My question is does anyone know how to do a proper system reset on this system or can anyone point me in the right direction to fix this, a diagram or photo would greatly help. Thanks