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Strong Spas Topside Control Communication Failure

Display is blank or shows only dashes; spa has power but no normal readout

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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.

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Possible Causes

Loose or damaged topside control cable, Water intrusion into keypad, Failed topside control panel, Control board communication port fault

How to Fix / Troubleshooting

Safety first: Turn off power at the GFCI breaker before unplugging or plugging any control cables.

Steps to troubleshoot blank/dash display:

  • Inspect topside cable: Open the equipment bay and locate the ribbon or data cable from the topside to the control pack. Ensure it is fully seated and not pinched or cut.
  • Check for moisture: Inspect the back of the topside panel for condensation or water damage. If present, the panel may need replacement and the area should be dried.
  • Test with replacement panel (if available): If you have access to a compatible Strong Spas topside, connect it temporarily to see if the display returns.

When to call a technician: If cabling is intact and a new topside does not restore communication, the control pack’s display driver may be faulty and require replacement.

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Repair Difficulty

Hard 4/5

Required Part

Topside Control Panel
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