My cal spa heater light does come on. It does heat up a little. I have even took the filter out and I have the same problem. I do not have a manuel for the spa. I miss my heat. I was told it could be the heating element. I don't know what it looks like to take it in to be tested. If it is the element, what does it look like and how do I take it off to get it tested? Does the spa have to be drained to take it off?