Heater frequently shuts off on high limit when spa is in use with low water level

Safety first: Ensure spa users are clear before adjusting valves or equipment.

• Maintain water level: Keep spa water level above all suction and return fittings to prevent air ingestion.
• Adjust valves: Set valves so that adequate flow passes through the heater when in spa mode, even with jets on.
• Reduce heater output: If possible, lower the set temperature slightly to reduce cycling.
• Monitor operation: Observe the heater and spa during use to ensure stable flow and temperature.

Note: Very small spas with large heaters may require careful flow management to avoid rapid overheating.