Everything That A Jacuzzi Brand Spa Owner Needs to Fix Their Spa
   
 
Both sensors should be close in value. The #1 problem I found is getting to the actual wire of the sensor plug to check. Typically, your probe will not reach the wire and so you get a -0- reading. You might have to either separate the sensor wires from the plug or temporarily rig a small piece of wire to each plug to test the sensor.

This is Balboa's Sensor Testing Ohm Resistance Table (test varies with OEM)

 

Typical Resistance Values for Sensors and the water temperature.

Temp Resistance
59 55.0
65 40.0
77 30.0
84 25.5
94 20.2
99 18.1
101 17.2
104 16.2
106 15.4
108 14.7
110 14.1
115 12.7
121 11.1

 

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