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Thermistor, High Limit, Solana & Hot Spot, 2006-current

Item #: 73992

Thermistor, High Limit, Solana & Hot Spot, 2006-current


This newly designed high limit thermistor places the original black plastic tipped version . It is a safety device that will shut down power to the spa if the water temperature exiting the heater is too hot. This would indicate a "low water flow" condition. Secondly, if this sensor is faulty then the spa can shut down requiring you to shut off power to the spa, then re-establish power in order to reset the unit. This thermistor is for  2006-now Hot Spot spa models (except Sprint & Dash) and all 2006-forward Solana spa models.

Test Procedure
1. Set the meter to 20K on the OHM scale.
2. Record the temperature of the spa water.
3. Unplug the thermistor from the control box.
4. Meter across the two Thermistor leads.
5. Refer to the Temperature versus Resistance chart below to find the correct resistance value for the temperature measured. If the temperature and resistance does not match that of the chart, this test has failed and the thermistor must be replaced. Remember if the spa has been inactive, the spa water temperature may be different
than the water temperature in the heater housing.

This chart shows the OHM range of the thermistor
Click to enlarge
Printable PDF

Check Serial Number Compatibility

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Thermistor, Control Thermostat, Solana & Hot Spot-2006-Curr

This Control Thermostat Thermistor communicates the actual water temperature to the controller (control box motherboard) to shut off the heater when the spa reaches target temperature. It is used on all 71584, 73859, 72469, 76840 and 76091 control boxes.

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