F8 error, spa may not respond to button presses or may reboot intermittently

Safety first: Turn off power at the breaker before disconnecting or reconnecting any control cables.

• 1. Inspect topside panel:
  • Check for condensation or water under the display window.
  • Ensure no buttons are stuck or physically damaged.
• 2. Check cable connections:
  • Open the equipment bay and locate the topside control cable plugged into the main control board.
  • Unplug the cable, inspect for corrosion or bent pins, then firmly reconnect.
• 3. Examine cable routing:
  • Follow the cable from the panel to the control pack.
  • Look for pinched, cut, or chewed sections and repair or replace as needed.
• 4. Test operation:
  • Restore power and see if F8 clears and the panel responds normally.
• 5. Replace panel if needed:
  • If the error persists and the cable is intact, replace the topside control panel with a Wellis‑compatible unit.
  • If a new panel does not resolve the issue, the control board communication circuit may be defective and require replacement.