How to Fix / Troubleshooting

Safety first: Turn off power to valve actuators before manual adjustment if required.

Steps to restore correct heating:

Check valve positions: Verify that the suction and return valves are correctly set for pool or spa mode. The spa should be isolated when heating spa only.
Test actuators: Manually move valve actuators to confirm they rotate fully and in the correct direction.
Verify heater mode: Ensure the Jacuzzi heater is set to pool or spa mode matching the valve configuration.
Review automation: Check pool controller programming for correct valve and heater commands.

Jacuzzi pool heater heats the spa but not the pool, or vice versa, when using a shared system.

Possible Causes