The heater will not come on. I can push the button for the left side jets and the heater light comes on. If I push the button for the right side jets it doesn't affect the heater light. I push the far right button and nothing happens. I have no manual for this Leisure Bay model 4000M and there is not wiring diagram (schematic) under the covers. HELP

Does it use a seperate circ pump? I think it does, it draws it's water from pump one, so when pump one is energized, there's adequate flow to close the pressure/switch, and closing the heater circuit.

Check for proper circ pump flow, or, clean your filter if it uses low speed on a 2 speed pump to heat. Also, check for proper pressure switch calibration.

I found what looks like all the Leisure Bay Owner Manuals at the following website:

http://www.spasbyleisurebay.com/PDF_Manuals/

There are schematics, instructions, and a lot more information, but you'll have to know the series of your spa (not just the Model #).

Hope this helps!