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Artesian Spas Dry Fire Protection / Heater Over-Temperature Without Flow

Display shows dy or DY and spa shuts down heating cycle

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Heater energized without adequate water flow, Severely blocked filters, Failed or stuck heater relay, Faulty flow detection

How to Fix / Troubleshooting

Safety: Immediately turn off power at the GFCI breaker. A dry-fired heater can be a fire and shock hazard.

  • Inspect heater manifold: Look for signs of discoloration, melting, or scorching on the heater tube and nearby wiring.
  • Check filters and water level: Clean filters thoroughly and ensure proper water level.
  • Verify pump operation: With power restored briefly, confirm that the circulation pump runs before the heater is allowed to energize. If the heater comes on with no flow, shut power off and do not use the spa.
  • Test heater relay (advanced): If the heater remains energized when it should be off, the control board relay may be welded closed and the control pack should be replaced or professionally repaired.

Because dry-fire can severely damage the heater and control pack, have a qualified Artesian spa technician inspect the system before further use.

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Repair Difficulty

Professional Required 5/5

Required Part

Heater Assembly for Artesian Spas
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