Display shows dy or DRY, spa attempts to heat then shuts down with error, often after a refill.

Safety: Turn off power at the GFCI before working on plumbing.

• Re-bleed circulation lines: Loosen both unions on the circulation pump and heater slightly to purge trapped air. Retighten securely.
• Inspect slice valves: Confirm that all slice/knife valves are fully open and that the locking clips are in place so they cannot drop partially closed.
• Check for suction blockage: Inspect skimmer and suction fittings for obstructions such as leaves, toys, or debris.
• Test circulation pump: With power restored, listen for the circulation pump. If it hums but does not move water, the impeller may be jammed or the motor failed.

Continued dy errors after proper bleeding and cleaning usually indicate a failing circulation pump or a damaged heater. Replacement of these components is typically a professional-level repair.