Display shows dashes (---) or blank 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 water temperature sensor, Broken sensor wire, Faulty control board input, Sensor not seated in heater well

Safety: Turn off power before working on sensors or the control pack.

Locate sensor: Find the MAAX water temperature sensor on the heater tube or in the sensor well.
Check connection: Ensure the sensor plug is firmly connected to the control board.
Inspect cable: Look for visible damage or rodent chewing.
Test sensor: Measure resistance and compare to MAAX specifications for the current water temperature.
Replace if needed: Install a new water temperature sensor if the old one is open or out of range.

Medium 3/5

Water Temperature Sensor (Thermistor)

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