Jacuzzi pool heater display shows SP and the unit will not heat; often associated with spa mode or remote control.

Safety first: Turn off power before changing internal dip switches.

Steps to resolve SP:

• Verify mode selection: On the Jacuzzi control panel, confirm whether the unit is in pool or spa mode as intended. Switch modes and see if SP clears.
• Check external automation: If connected to a pool controller, verify that the automation is not locking the heater into a specific mode or setpoint.
• Inspect dip switches: Refer to the Jacuzzi installation manual for correct dip switch settings for your application (pool only, spa only, or pool/spa). Correct any mis-set switches.
• Mode switch test: If the physical pool/spa selector is intermittent or unresponsive, it may need replacement.