1983-1993 1994-2002 2002-Present Gatsby Spas Spa Siding

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Sensors Used In Electronic JWB Spas

 

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If the end connector is RED or WHITE.

 2600-023-21 Shown

Sensor TEST and Install Help 

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

If the end connector is BLACK.

Temp Sensor High Limit
21-637 21-638
$59.59 $28.46
 

 

 

Over Heat Sensor on JWB Vertical Heaters Only.

02-093

$17.25

 

 

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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