Thermistor's

This is the replacement thermistor for the 1999-2002 Hot Spot RE, RLX, SE, SLX and the 2001-2002 SLXtra (wood sided) spa models. Also the Solana 2000-2002 X, 2003-2005 RX, SX and TX models. This thermistor communicates the actual water temperature to the controller to shut off the heater when the spa reaches target temperature. Click the "More Info" button for details.

This control thermostat thermistor sensor detects the spa waters temperature and relays that information back to the system. It simply screws into the No Fault Heater Housing (hand tight only) and plugs into the outside of the spa's control box. If your existing thermistor plugs directly onto the main circuit board (motherboard) inside the IQ2020 control box, then use item 39205. Always replace thermistors in pairs ( ie; 38415 & 38416 ). Click the "More Info" button for details.

This is the replacement thermistor for all 1994 Hot Spring spa models and 1995-1998 Hot Spot RE, RLX, SE & SLX spa models.

This Control Thermostat Thermistor communicates the actual water temperature to the controller to shut off the heater when the spa reaches target temperature. It is used on all 2006-current Hot Spot Mallorca, Sorrento, Trinidad & Tobago spa models. It is also used on all 2006-current Solana RX, SX & TX spa models.

Replaces the obsolete 39530

Newly designed. This control thermostat thermistor is a safety device designed to communicate with the system to shut down the heater if the water temperature exiting your heater exceeds 118 degrees F. It simply screws into the No Fault Heater Housing (hand tight only) and then plugs directly onto the motherboard inside the IQ 2020 control box. (If your existing thermistor plugs into the outside of the spa's control box see item 38415). Always replace thermistors in pairs (ie; 39204 & 39205 ). Click the "More Info" button for details. Click the "More Info" button for details.

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.

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.

This high-limit thermistor sensor is a safety device designed to communicate with the system to shut down the heater if the water temperature exiting your heater exceeds 118 degrees F. It simply screws into the No Fault Heater Housing (hand tight only) and then plugs into the outside of the spa's control box. If your existing thermistor plugs directly onto the main circuit board (motherboard) inside the IQ2020 control box, then use item 39204.  Always replace thermistors in pairs (ie; 38415 & 38416). Click the "More Info" button for details.

*Temporarily on back order with the factory, limited inventory as of 5/29/2018. Please use 39525 as a replacement for now. 

Newly designed. This high-limit thermistor sensor is a safety device designed to communicate with the system to shut down the heater if the water temperature exiting your heater exceeds 118 degrees F. It simply screws into the No Fault Heater Housing (hand tight only) and then plugs directly onto the motherboard inside the IQ 2020 control box. (If your existing thermistor plugs into the side of the spa's control box see item 38416). Always replace thermistors in pairs (ie; 39204 & 39205 ). Click the "More Info" button for details.