E13 displayed and the spa will not start; sometimes after water has splashed onto the control unit.

Safety first: If a ground fault is suspected, do not attempt to operate the spa until the fault is located and corrected. Risk of electric shock.

• Inspect for moisture:
  • Unplug the spa and open the control box housing.
  • Look for water droplets, corrosion, or damp insulation.
  • Dry thoroughly and allow 24 hours before retesting.
• Check heater and pump housings:
  • Inspect the heater tube and pump body for cracks or burn marks.
  • Any sign of leakage or damage requires replacement of the affected component.
• Test RCD/GFCI plug:
  • Press the TEST and RESET buttons on the plug (if equipped) according to the manual.
  • If it will not reset, the plug assembly may be faulty and should be replaced.
• Persistent E13: If no visible damage is found, a megohmmeter (insulation tester) is needed to check heater and pump insulation. This should be done by a qualified technician. Replace the leaking component or the entire control box and heater assembly as required.