The sensors tested fine and are only a few months old. The control head was also replaced a few months ago. Everything I replaced a few months ago is heat sensors, circ pump, main board, control head, and heater relay board. It was working fine for a while then just suddenly wasn't one day.
The control head seems fine. It displays everything you'd expect to see including an image when I click the jets on. I do hear the relays click when I do jets 1, jets 2, or clean. And from my understanding the heater relay board should have a D9 and a D10 light on but only the red one D9 light is on. I feel like that should be a big clue but I don't know what that clue is.
I also agree that I would assume the pump and heater would be unrelated but they did stop working at exactly the same time so that has me thinking they are linked.