Display shows three dashes (---) or similar, no temperature reading, spa may not heat.

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.

Possible Causes

Temperature sensor unplugged from control board, Broken sensor wire, Sensor not seated in well, Control board input failure

Safety first: Disconnect power at the breaker before accessing the control pack.

Check sensor plug: Locate the temperature sensor connector on the Clearwater Spas control board and ensure it is fully seated.
Inspect cable: Look for breaks or chew marks (rodent damage) along the sensor cable.
Reseat sensor: Make sure the sensor bulb is fully inserted into its well or threaded port.

If the display still shows dashes, the sensor or control board likely needs replacement.

Medium 3/5

Temperature Sensor

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