Display shows HL and spa shuts down heater; pumps may continue to run.

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

• Restore proper flow:
  • Remove and clean all filter cartridges.
  • Check that all slice valves are fully open.
  • Bleed air from the circulation pump and heater unions by loosening slightly until water flows, then retighten.
• Check for kinks or blockages:
  • Inspect flexible hoses around the circulation pump and heater for kinks or collapsed sections.
  • Look for debris in suction fittings and skimmers.
• Reset high-limit (if manual reset type):
  • Locate the high-limit reset button on or near the heater tube (if equipped) and press firmly.
• Replace high-limit sensor if recurring:
  • If HL returns quickly despite good flow, the high-limit sensor may be overly sensitive or failing.
  • Replace with a USSPA-compatible high-limit sensor.