Display shows E6; spa may not start heating or may shut down unexpectedly.

Safety first: Unplug the spa before removing any covers or hoses.

• Verify water level and bubbles: Ensure the spa is filled to the correct level. Avoid running the heater with the bubble function on high, as this can disturb the level sensor on some MSPA models.
• Bleed air: Gently press the spa walls and run filtration (not heat) to purge air. If your MSPA has a manual bleed screw near the pump, open it slightly to release trapped air, then close once water flows steadily.
• Inspect flow/level sensor: Locate the MSPA flow switch or water level sensor (often in a small chamber near the suction). Check that the float moves freely and that no debris is jamming it. Clean gently with fresh water.
• Check wiring: Open the control box and verify the sensor connector is firmly seated on the PCB. Look for corrosion or moisture; dry carefully if needed.
• Replace sensor: If E6 persists and the float/switch appears physically intact, replace the MSPA flow/level sensor assembly with the correct part for your model.