Display shows COOL and water temperature is significantly below setpoint, heater may be limited

Safety first: Ensure proper electrical configuration before changing modes.

• Verify mode: Set the spa to Standard mode so it can heat continuously.
• Check power configuration: If running on 120V, heat-up will be slow. Consider wiring to 240V per Master Spas specifications for faster heating.
• Keep cover closed: Close and latch the cover to minimize heat loss.
• Monitor heater indicator: Confirm the heater icon or indicator is on when the spa is calling for heat. If not, troubleshoot heater and control pack.