Display shows COL or COOL, spa stops heating and may run pumps to circulate water.

Safety: Ensure the spa is filled to the proper level before running pumps to avoid air ingestion.

• Verify set temperature: Confirm the set temperature on the Evolution Spas control panel is above the current water temperature.
• Allow time to heat: After a refill with cold water, it can take many hours to reach set temperature. Leave the cover on to retain heat.
• Check for heating: With pumps running, feel the heater return jet. It should gradually become warmer. If there is no temperature increase after several hours, the heater may not be energizing.
• Inspect filters and flow: Ensure filters are clean and water flow is strong; poor flow can prevent heating even without a FLO code.

If COL persists and the spa never warms, the heater or control board may require service. Contact a qualified technician for electrical testing.