NetSpa spa produces a high-pitched whining or humming noise from the pump area, but water flow is low or intermittent.

Safety first: Unplug the spa before manipulating hoses or fittings.

• Check water level: Ensure the water is above the minimum mark and covers all suction fittings.
• Prime the pump: With power off, slightly loosen a hose connection at the highest point to release trapped air until water seeps out, then retighten.
• Secure fittings: Tighten suction fittings and ensure O-rings are intact to prevent air being drawn in.

After re-priming, plug the spa back in and test. If humming continues with poor flow, the pump may be damaged and require replacement.