Ozone generator indicator is off and there is no ozone smell when the spa is circulating.

Safety first: Turn off power before handling ozone equipment.

• Check indicator: Some Aquaterra ozone units have a small indicator light. If it is off during circulation, the unit may not be powered.
• Inspect tubing: Verify that the clear ozone tubing is connected from the generator to the injector and is not kinked or cracked.
• Replace ozone unit: Ozone generators typically have a limited lifespan (2–3 years). If older, replace with a compatible Aquaterra ozone unit.

Ozone is supplemental sanitation; the spa will still operate without it, but water care may be more demanding.