Display shows F2 and heating is disabled; spa may run pumps but will not heat.

Safety first: Switch off the spa at the main breaker and allow water to cool before working on the heater area.

• Check water flow: Confirm that jets and circulation are strong. Clean or replace the filter cartridge to ensure proper flow through the heater.
• Inspect for kinks or closed valves: Verify that all valves around the heater and pump are fully open and that hoses are not kinked.
• Reset high-limit (if accessible): Some Aquavia Spa heater assemblies have a manual reset button on the high-limit. Press gently until it clicks. Do not repeatedly reset without addressing the cause.
• Descale if needed: If you have hard water and the spa is older, scale may restrict heater flow. This typically requires draining and removing the heater tube for descaling or replacement—best done by a technician.
• Restore power and monitor: Turn power back on and monitor temperature rise. If F2 reappears quickly, the high-limit sensor or heater relay may be faulty and the heater assembly or control pack may need replacement.