Cancelling needless freeze protection on pool filter

pool

For some reason the temperature sensor on my Paddock Aquatouch no longer reads the correct temperature. It thinks my pool water temperature is in the range of 30F despite the fact that it is actually about 85F. As a result, it keeps needlessly turning on my pump filter every 5 minutes! How can I disable this? I've Googled for my control system model but it is pretty old and all the results show newer models which have controls mine doesn't. I assume there's a temp sensor somewhere I can disable it from listening to maybe? How?

By playing around a bit with the buttons in all the combinations I could think of I did find that when I press "Program, Enter" I get the following message:

Press devices to activate for freeze protection - press enter when finished

Unfortunately, just hitting enter informed me that the filter pump was protected. I tried adding and removing a couple other pumps, but while I was able to add them, I wasn't able to remove them! When I hit enter it says:

Devices allocated to freeze protection are:
  Pump
  Aux7
  Pool Htr
  Spa Htr
Freeze protection is enabled

Implying there is a way to disable it. But I haven't been able to find a combination to do that.

Update: Here is a picture of the controller.
enter image description here

I found what I think is the temperature sensor attached to the piping.
enter image description here

The circuit board (A Jandy Aqua Link 5574C) is shown here. I have circled in red where the temperature sensor wires appear to connect. However, there are 4 wires instead of the expected two: green, yellow, red and black.
enter image description here

I have ohmed out these 4 wires with no power:

black and red: 1.2 ohms

black and green: 1.5k ohms

yellow and green: 1.5k ohms

Update: After I closed up the box and turned power back on after taking the bottom picture, the temperature reading went as high as 84F before dropping first to 75F and then 49F.

Best Answer

I suspect the 30°F reading is what the sensor indicates if it were disconnected. Inspect the wiring between the controller and the sensor which is mechanically connected to the plumbing somewhere. It could be a sensor failure, but is most likely a wiring problem.

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