Display shows dashes (---) or 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

Disconnected temperature sensor, Broken sensor wire, Sensor not fully inserted into well, Control board not detecting sensor

Safety: Turn off power before handling sensors or wiring.

Step 1 – Locate sensor: Find the primary temperature sensor on the heater tube or in a dry well on the AquaRest control pack.
Step 2 – Check connection: Ensure the sensor plug is fully seated on the control board and that the cable is intact.
Step 3 – Reseat sensor: If the sensor is in a well, remove and reinsert it fully to ensure good contact.
Step 4 – Replace if needed: If the display still shows dashes, replace the temperature sensor with a compatible part.

Medium 3/5

Primary Temperature Sensor

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