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Hot Spring Sensor Out of Range / Communication Error

Display shows three dashes or “---”; spa is unresponsive or will not heat.

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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

Disconnected temperature sensor, Open sensor circuit, Incorrect sensor type installed, Control board firmware issue

How to Fix / Troubleshooting

Safety first: Turn off power at the breaker before opening the control box.

  • Inspect sensor plugs: Open the IQ control box and verify that all thermistor connectors are firmly seated on the board.
  • Check for wrong parts: If sensors were recently replaced, confirm that genuine Hot Spring-compatible thermistors were used.
  • Look for board damage: Examine the control board for burned components or corrosion.
  • Power reset: After reseating connectors, restore power and see if the display returns to normal.

If the dashes remain, the control board or sensors require professional testing and likely replacement.

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Repair Difficulty

Hard 4/5

Required Part

IQ Control Board
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