Not sure if this is what you are looking for, but I believe Sundance can be set to run on either 40, 50 or 60 amps. I think most are set at 50 amps from the dealer. If you change this setting it will affect what controls will work with each other. As an example, I believe if you have it on 50 amps, the heater will not run if you have both pumps engaged. If you have it set at 60 amps the heater will run with both pumps engaged.
The information I’m providing is not from any knowledge I have on the Sundance Cameo, but rather on our Jacuzzi hot tub, but I’m pretty sure Sundance is the same. Hope this helps.