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Thread: Temperature probe bad?

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    Temperature probe bad?

    Hayward Aqua Plus Pro Logic Controller suddenly showing incorrect temperature of 41f. Air temp is high 70ís to mid 80ís. Instant-read thermometer says water is 75.8. Bad probe, or maybe bad board internally? All other readings/numbers appear normal. Search on amazon doesnít even show temp probe as available part.
    About 23,200 gal vinyl in ground, "stop sign" shaped 22x22, Polaris 3900 cleaner, Hayward Aqua Plus Pro Logic Controller, Hayward T-15 SWG cell, Hayward S244T sand filter.

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    In the Industry

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    Re: Temperature probe bad?

    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.

    10,000 gal pool with Pentair Intellitouch i5 and indoor controller, Goldline Aqua Rite salt water gen, Intelliflo variable speed pump.
    I tinker with the pentair controllers and have re-flashed firmware, replaced lcds, repaired main boards, and replaced the rs485 transceivers in both the indoor and outdoor controllers.

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    Re: Temperature probe bad?

    Thanks, but don’t have a multimeter handy.
    About 23,200 gal vinyl in ground, "stop sign" shaped 22x22, Polaris 3900 cleaner, Hayward Aqua Plus Pro Logic Controller, Hayward T-15 SWG cell, Hayward S244T sand filter.

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    Mod Squad jblizzle's Avatar
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    Re: Temperature probe bad?

    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.
    Jason, TFP Moderator
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    Re: Temperature probe bad?

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

    Which temperature are you taking about?
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    Re: Temperature probe bad?

    Water temp
    About 23,200 gal vinyl in ground, "stop sign" shaped 22x22, Polaris 3900 cleaner, Hayward Aqua Plus Pro Logic Controller, Hayward T-15 SWG cell, Hayward S244T sand filter.

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    Mod Squad jblizzle's Avatar
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    Re: Temperature probe bad?

    Swap the air and water wires in the controller and see what happens.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: Temperature probe bad?

    I’ll try that in a bit. Time to grill some pork tenderloins right now.
    About 23,200 gal vinyl in ground, "stop sign" shaped 22x22, Polaris 3900 cleaner, Hayward Aqua Plus Pro Logic Controller, Hayward T-15 SWG cell, Hayward S244T sand filter.

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    Re: Temperature probe bad?

    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.
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    Re: Temperature probe bad?

    12300 gallon IG pebble, freeform 19x28, 1 skimmer, 3 returns, no floor drains, auto fill. Pentair: EasyTouch PSL4, ScreenLogic2, Indoor Control Panel, Intelliflo 2 VST, IntelliChlor IC40, IntellipH, CCP320 Cartridge Filter, MasterTemp 250 Heater, Rebel Suction-Side Cleaner, IntelliBrite. Solar and cleaner actuators. Heliocol HC-50 8-panel solar heating. FlowVis Flow Meter. Taylor: K-2006 and K-1766 Test Kits, SpeedStir. City/softened water.

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    Re: Temperature probe bad?

    Quote Originally Posted by JamesW View Post
    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.
    About 23,200 gal vinyl in ground, "stop sign" shaped 22x22, Polaris 3900 cleaner, Hayward Aqua Plus Pro Logic Controller, Hayward T-15 SWG cell, Hayward S244T sand filter.

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    Re: Temperature probe bad?

    You probably just need to replace the temperature sensor.
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