Hi I have a 1997 cal spa. I have installed a new 2 speed motor, new heating element, new pressure switch and a new filter. Last year, no problems but this year cannot get it to heat up. Heat light will not come on no matter what I do. I will add that near the end of last year it was touch and go on the heater working. This is why I replaced all these parts. What else can I check.
Thanks
Ron

Either you got a bad heating element or you installed it wrong or you need a new spa pak. A spa pak is the controller board that all of the motors and acessories plug into

Are you getting any error coeds on the display? That would be helpful