Control panel shows F7 and spa may shut down or run erratically; often related to power input issues.

Safety first: This fault involves mains voltage. If you are not experienced with electrical work, contact a licensed electrician or spa technician. Always turn OFF power at the main breaker and lock it out before opening the control box.

• Verify supply voltage:
  • Check the spa's rating label for required voltage (e.g., 230V single-phase).
  • With a multimeter and power ON (only if qualified), measure voltage at the control pack line terminals; it should match the rating within ±10%.
• Inspect wiring connections:
  • Turn power OFF.
  • Open the control box and inspect the main terminal block where supply wires connect.
  • Tighten all lugs to manufacturer torque specs; look for discoloration or melted insulation.
• Check configuration jumpers/dip switches:
  • Confirm that voltage selection jumpers or dip switches on the USSPA control board are set correctly for your supply.
  • Incorrect settings can trigger F7 and damage components.
• Breaker and cable sizing:
  • Verify that the spa is on a dedicated breaker of the correct amperage and that the cable gauge meets USSPA installation requirements.
  • Replace undersized or damaged cable and upgrade breaker if necessary (by a professional).
• Control board damage:
  • If voltage and wiring are correct but F7 persists, the power supply section of the main control board may be damaged and require replacement.