Control panel displays F1 and spa functions are disabled or intermittent; keypad may beep randomly.

Safety first: Turn off power to the spa at the main breaker and verify with a non-contact voltage tester before opening any panels.

• Power cycle the spa: Turn the breaker OFF for 5 minutes, then ON. Check if F1 clears. If it returns, continue.
• Inspect the topside control panel:
  • Remove the spa side panel to access the underside of the topside control.
  • Check the keypad ribbon cable where it plugs into the USSPA main control box. Reseat the connector firmly.
  • Look for moisture, corrosion, or green/white deposits on the connector and cable. Dry gently with a clean cloth; do not use a heat gun.
• Check for physical keypad damage:
  • Look for cracked overlay, water under the display window, or stuck buttons.
  • If buttons feel spongy or stick, the membrane is likely compromised and the keypad/topside assembly should be replaced.
• Isolate keypad vs. board:
  • With power OFF, disconnect the keypad ribbon from the main control board.
  • Restore power briefly. Many USSPA control packs will show a different error or remain blank when keypad is disconnected. If F1 disappears with keypad unplugged, the keypad is suspect.
  • If F1 persists even with keypad unplugged, the keypad interface on the main control board is likely faulty.
• Replace faulty component:
  • Order the correct USSPA-compatible topside control panel using the spa model and control pack model number.
  • If the main control board is faulty, replace the entire control board module following USSPA wiring diagrams and label all wires before removal.

Note: If you are not comfortable working inside the control box, contact a qualified spa technician.