It appears that the Aqualink temperature sensor is what is known as a "10k thermistor". There are several types of 10k thermistors which read slightly different temperatures, but the basic idea is that the electrical resistance of the thermistor changes as temperature changes. A 10k thermistor will have a resistance of 10,000 ohms at 75 degrees F. For your thermistor to have a reading of 152 deg F would require the resistance to be somewhere between 1700 ohms and 2400 ohms per this link http://www.veris.com/file_uploads/RT...graph_i0l2.pdf
Although the thermistor is probably broken, you could try swapping the wires of two different temperature sensors where they connect to the Aqualink circuit board and see if the problem seems to move with the swapped temperature sensor (means the temperature sensor is bad) or stays put (means the temperature input on the Aqualink circuit board is bad).
Here is one person's fix for the Aqualink temperature sensor, but it should work for any system if it is utilizing 10k thermistors.
http://www.mycal.net/?cpath=/Project...d=387&action=9
Good luck. Let us know what you find and what you end up doing.
Titaniumboy
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