Control panel shows F9 and spa may shut down heating and pumps intermittently.

Safety first: Turn OFF power at the breaker. Overcurrent faults can indicate serious electrical issues.

• Check for obvious shorts:
  • Inspect all pumps, blower, and ozonator wiring for melted insulation or exposed conductors.
  • Look for water leaks dripping onto electrical components.
• Isolate accessories:
  • Disconnect non-essential accessories (ozonator, LED lighting, audio systems) one at a time and power up to see if F9 clears.
  • If F9 disappears when a specific accessory is disconnected, that accessory is likely faulty.
• Verify breaker and wiring:
  • Ensure the spa is on the correct amperage breaker and that wire gauge meets USSPA specifications.
  • Replace undersized or damaged wiring via a qualified electrician.
• Control board inspection:
  • Open the control box and look for burned components, especially near high-current traces and relays.
  • If damage is visible, replace the main control board.
• Professional evaluation:
  • If no obvious cause is found, have a spa technician measure running currents of each component to identify overload conditions.