F8
USSPA
Control System Internal Error
Display shows F8 and spa may not respond to button presses; random resets or lockups occur.
Advertisements
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Advertisements
Possible Causes
Firmware corruption in USSPA control board, Failing low-voltage power supply on control pack, Electrical noise or surges affecting logic circuits, Moisture ingress into control box
How to Fix / Troubleshooting
Safety first: Turn OFF power at the breaker before opening the control box.
- Basic reset:
- Turn OFF power for at least 10 minutes to fully discharge internal capacitors.
- Turn power ON and observe if F8 returns immediately or after some time.
- Check for moisture and corrosion:
- Open the equipment bay and inspect the control box for signs of water leaks or condensation.
- If moisture is present, identify and repair the leak (e.g., pump unions, heater unions) and allow the control box to dry completely.
- Inspect low-voltage wiring:
- Check all low-voltage connectors (sensors, keypad, LED lighting) for corrosion or loose pins.
- Reseat connectors firmly.
- Surge protection:
- If F8 occurs after storms or power events, consider installing a dedicated surge protector for the spa circuit.
- Board replacement:
- If F8 persists despite stable power and dry conditions, the main control board logic may be defective.
- Replace the USSPA control board with the exact model specified for your spa.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Main Control Board
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements