Display shows DY or DRY Y, spa indicates dry heater condition and may lock out heating.

Safety first: Turn off power at the breaker. Do not repeatedly reset and run the heater if a dry condition is suspected.

• Verify strong water flow: Confirm that the circulation pump is running and that water is moving vigorously through the heater return.
• Check for kinks or blockages: Inspect flexible hoses to and from the heater for kinks, collapsed sections, or obstructions.
• Inspect heater and sensors: Look for signs of overheating on the heater tube. Ensure sensors are properly attached and not loose.

If DY continues with confirmed good flow and normal water temperature, the temperature sensor or control board may be faulty and should be diagnosed by a spa technician.