Display shows SL or SLP, spa maintains a lower temperature and heats primarily during filter cycles.

Safety: No tools required; changes are made at the control panel.

• Review mode: Use the Mode button to cycle through available modes until you reach Std (Standard) or EC (Economy) depending on your preference.
• Adjust set temperature: Increase the set temperature to your desired level.
• Allow time to heat: Keep the cover closed and allow several hours for the spa to reach the new temperature.

If the spa remains cool even in Standard mode, further troubleshooting of the heater and sensors is needed.