Jacuzzi 1983-1993 Models Jacuzzi 1994-2002 Models Jacuzzi 2002-Present Models Gatsby Spas Spa Siding Retro Kits
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Sensors Used In Electronic Jacuzzi Whirlpool Hot Tubs

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If the end connector is RED or WHITE.

 2600-023 Shown

Sensor TEST and Install Help 

Temp Sensor Only High Limit Only Complete Assembly (Temp and High Limit)
21-022 21-021 21-337
F807, 2600-022
F806, 2600-021
F805, 2600-023
$42.90 $55.95 $76.10

If the end connector is BLACK.

Temp Sensor High Limit
S092, 2000-637
S093, 2000-638
$59.59 $28.46


Over Heat Sensor on JWB Vertical Heaters Only.


P518, 6000-093



Sensors For The 2002+ "J Series" Spas


Sensors Education

Sensors: Hot tubs use TWO sensors. The Temperature and the Overheat or High Limit sensor. 

Sensors basically change resistance values as the water heats or cools. The change in resistance tells the board the temperature of the water and the heater. If the sensor itself gives faulty or no resistance values, the spa will not operate or operates wrong. The board is smart enough that it will typically tell you by sensor error messages if the values are out of range by giving you a sensor error code on the topside. See Sensors Table

Many installed their temperature sensor in the bottom of the filter cabinet. Others by use of a sensor housing. This sensor tells the board actual temp. If the topside reading on the board is off, then its usually this sensor (could be the board). If the board sees the water get too hot, it will attempt to cool the spa or shut down completely.

The OH or High Limit sensor has one purpose in life. It sits next to the heater and watches the heater closely. If the heater starts to overheat, the board sees the temp on the OH sensor and will shut the spa down. So if you get an OH error, either the heater IS overheating OR the sensor has failed.

FYI: Sensors can be sporatic in the readings. If you see the topside change temp readouts in large increments, likely the Temp sensor needs replacing..


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Sensor TEST and Install Help


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