Spa water cools down quickly between use even though cover is on

Safety first: Ensure the spa remains powered so freeze protection can operate if needed.

• Inspect cover: Check the Master Spas cover for heavy, waterlogged foam, tears, or poor fit. Replace if it no longer seals well.
• Check cover latches: Ensure all latches are engaged to minimize heat loss.
• Inspect cabinet: Look for missing or displaced insulation panels inside the cabinet and around the equipment bay. Replace or add insulation where appropriate, without blocking ventilation.
• Verify heater cycling: Confirm the heater turns on as needed to maintain set temperature. If not, troubleshoot heater and sensors.