Display shows dashes (– –) or blank temperature reading; spa may still run pumps but not heat correctly.

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, Sensor reading outside valid range, Damaged sensor cable, Control board fault on Tuff Spas pack

Safety: Turn off power at the breaker before accessing the control pack.

Step 1 – Inspect sensor connection: Open the equipment compartment and locate the temperature sensor plug on the control board. Reseat the connector.
Step 2 – Check cable: Look for cuts, abrasions, or rodent damage along the sensor cable.
Step 3 – Replace sensor: If the issue persists, replace the temperature sensor with a compatible Tuff Spas part.

If dashes remain after sensor replacement, the control board may be defective and should be evaluated by a spa technician.

Medium 3/5

Temperature Sensor

Check Price on Amazon

We may earn a commission from links on this page.