Display shows DR and heater is disabled; spa may think it is running dry.

Safety first: Turn OFF power at the breaker before opening unions or removing filters.

• Check water level:
  • Ensure the spa is filled to the recommended level, typically above all jets and skimmers.
• Open all valves:
  • Verify that all slice valves around the pumps and heater are fully open.
• Bleed air from heater and pumps:
  • Loosen the unions on the circulation pump and heater until water flows steadily, then retighten.
• Clean filters:
  • Remove and rinse filters to ensure they are not restricting flow.
• Reset and test:
  • Restore power and observe if DR clears.
  • If DR persists, there may be a sensor or control issue requiring professional diagnosis.