Display shows CF or CLn and prompts for filter cleaning; the spa may limit heating or run pumps more often.

Safety first: Turn off power before removing filters to avoid debris being drawn into the system.

• Remove filters: Take out all Master Spas filter cartridges.
• Clean thoroughly: Rinse with a garden hose from inside out. For heavy buildup, soak in a filter cleaner solution and rinse well.
• Inspect for damage: Replace any filters with cracked end caps or collapsed pleats.
• Reset reminder: Follow the control panel instructions to reset the filter reminder (often by pressing a specific button sequence).