Temperature probe bad?

[cajunfla]

Hayward Aqua Plus Pro Logic Controller suddenly showing incorrect temperature of 41f. Air temp is high 70’s to mid 80’s. Instant-read thermometer says water is 75.8. Bad probe, or maybe bad board internally? All other readings/numbers appear normal. Search on amazon doesn’t even show temp probe as available part.

 

[ogdento]

If you have a multimeter you can measure the resistance of the probe.

Off the top of my head I don't know what value would give 41 degrees, but 10k ohms works out to 76 degrees. I'm sure there's another thread about testing probes on this site that has more resistance/temp values.

 

[cajunfla]

Thanks, but don’t have a multimeter handy.

 

[jblizzle]

They are free at Harbor Freight

So switch a couple of the probes around in the control panel and see if the bad reading follows the probe or not.

Ignore the SWG temperature as that is a different type of probe that is in the cell.

 

[JamesW]

There is a water temperature, air temperature, cell temperature and a solar temperature (if solar enabled).

Which temperature are you taking about?

 

[cajunfla]

Water temp

 

[jblizzle]

Swap the air and water wires in the controller and see what happens.

 

[cajunfla]

I’ll try that in a bit. Time to grill some pork tenderloins right now.

 

[JamesW]

Hayward GLX-PC-12-KIT 10K Thermistor Temperature Sensor with 15-Feet Cable Replacement Kit.

The Pentair or Jandy temperature sensor will also work if you can find them cheaper.

There should be a sensor clamped in a pipe somewhere.

You might have a spare sensor from your installation package. Some installation packages include a solar temperature sensor.

 

[Dirk]

Pentair temp sensor:

 

[cajunfla]

Hayward GLX-PC-12-KIT 10K Thermistor Temperature Sensor with 15-Feet Cable Replacement Kit.

The Pentair or Jandy temperature sensor will also work if you can find them cheaper.

There should be a sensor clamped in a pipe somewhere.

You might have a spare sensor from your installation package. Some installation packages include a solar temperature sensor.

Pool came with the house. Previous owner didn't leave anything except hidden problems.

 

[JamesW]

You probably just need to replace the temperature sensor.