I purchased an old 2 person Polynesian spa. It has a pneumatic type control.After checking and replacing the heating unit and two relays, I still can't get it to heat the water. The spa says Polynesian and it seems to be made by Jacuzzi. The unit is 120Volt. I have good flow from the pump and the air works. No pilot light on to the heating unit, no voltage seems to be getting to the element. Controls seem pretty simple, a pneumatic switch and two relays. There is also a flow switch which seems to be working, as I can manualy triger it and check it with a multi meter. Anybody have a wiring schematic for this unit? Seems to have been made in the 80's??