
1. Turn off power to the spa at the GFCI.
2. Remove the front cabinet panel so you can see the main pumps and other equipment.
3. Remove the front panel on the equipment box so you can see the main circuit board. Look at the wiring diagram on the back of the panel.

4. Use the wiring diagram to locate the Temperature
/ Hi-Limit Sensor connector. Now, unplug
the connector from the main circuit board.

5. Remove the Hi-Limit Sensor from beneath the
heater sleeve.

Use this picture to identify parts for the next
few steps.
6. Loosen the black compression bushing
threaded into the white sensor tee. Back it off about 2-3 full turns. Remove the excess
silicone on top of the fitting.

7. Apply a thin layer of silicone onto the new temperature
sensor to act as a lubricant.
8. Remove the old sensor. Quickly insert the new sensor into the compression fitting.

9. Push until the sensor is even with the top of
the fitting. Re-thread the compression fitting
into the sensor tee until it is snugly in place.
Apply a dab of silicone as pictured above to
seal the sensor / fitting joint.

10. Insert the new Hi-Limit Sensor under the
heater sleeve. Discard the old Temperature /
Hi-Limit Sensor.

11. Feed the Sensor connector into the lower control
can and plug it back onto the main circuit
board.

12. Replace the front panel on the lower control
can.
13. Turn on power to the spa at the GFCI.
14. After the circulation pump is operating, check for leaks at the compression fitting. Replace
the main cabinet panel after everything is running properly.