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2002 Sundance Optima 850-Temp Adjustment: Actual Temp is not Display Temp

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eluvins:
I have a 2002 Sundance Optima 850 series w\LCD screen.  I recently replaced the temperature sensor as the former had failed.  After doing so, I noticed the actual water temperature did not match that of the display temp by using a pool\spa thermometer purchased at the hardware store; the actual temperature is 5 degrees F less than what is displayed.  The Max temp for the display is 104 degrees F, which means the actual max temp is only 99 degrees F.

Is there a simple way to calibrate the sensor\temp control or override the max temp to increase the set temperature?  Any direction is greatly appreciated.

Thanks,
Eric V.

SerjicalStrike:
You will need to replace the temperature sensor.

eluvins:
Thanks for the response.  I just replaced the temperature sensor...it's brand new.  Are you suggesting I may have received a faulty sensor?

Thanks,
Eric V.

SerjicalStrike:
It's one of 3 options.  The sensor is faulty, the board is faulty, or the thermometer is faulty.  In 18 years of working on Sundances, I've seen 1 board be the problem in that situation.  Every other time it is the temp sensor or the thermometer. 

In order to allow the spa to be set higher than 104, there is a jumper on the board that needs to be set.  JP9, 13.  Putting a jumper on there will allow the spa to be set up to 108. 

eluvins:
Got it.  Thanks for the direction.

Eric V.

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