Check the Wiring Diagram inside the System Box Cover, and the following appropriate Hot Sheet for the Correct Dip Switch Settings, based on All of the Spa Equipment Controlled by the System, and which Pump is plumbed through the Heater.
NOTE: These Hot Sheets may not represent the most current production.
See the Application Note site for the most current product reference.
At the Dip Switches on the System Board, Verify that All the Dip Switches are Set Correctly.
If they are Not Set Correctly, Set them Correctly Now.