I have a rather old hot tub "built 1995" that has now stopped heating and the stage 2 "high speed" is no longer working when I depress the jets button, but the stage 1 side of the pump is circulating water in the tub. The heating light dose come on in the control console but it dose not heat at all. I have checked the pressure switch and is functioning. I have also cleaned everything out made sure I am not air locked and verified all the lines are connected. I am thinking it is either the high limit relay or the hi speed pump relay. but I don't want to replace anything without having a why of checking them. I am open to any ideas
White Spring Spa
Model: Springfield #61
System 2000 Spa equipment system "control box"