Loud whooshing or whistling noise when bubble/air massage is running on MSPA spa.

Safety first: Disconnect power before inspecting the motor unit.

• Clear intake: Check the air intake vents on the MSPA motor unit. Remove any obstructions and clean dust buildup.
• Inspect air ring: With the spa empty, gently press along the air jet ring at the bottom to feel for collapsed sections. Straighten any kinks.
• Flush debris: Run the bubble function briefly with clean water to help flush small debris from the air jets.
• Internal hose check: If noise persists, open the motor unit and inspect the main air hose from blower to tub. Replace any kinked or crushed MSPA air hose.