Spa loses temperature quickly when bubbles are turned on; users feel water getting cold during bubble operation.

Safety first: Ensure the spa is on a stable, level surface before entering or adjusting covers.

• Preheat above target: Heat the spa 1–2°C (2–4°F) higher than your desired soaking temperature before turning on bubbles.
• Limit bubble duration: Use the bubble function in shorter intervals (10–15 minutes) to reduce cooling.
• Improve cover insulation: When not in use, keep the insulated cover on. Consider adding a floating thermal blanket on the water surface under the main cover.
• Use in milder conditions: In very cold or windy weather, bubble use will cool the water rapidly; limit use or shield the spa from wind.

Note: This is typically a design/physics limitation rather than a hardware fault.