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Thread: Inaccurate water temp reading

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    Default Inaccurate water temp reading

    Aqualink indoor controller indicates water temp is 82 degrees, but thermometer in pool is reading 65 degrees. Pool was installed 3 years ago. You can only re-calibrate the water temp settings on the indoor controller by approx. 4 degrees so I feel I have a problem, maybe the water temp sensor? Is there a way to test the sensor? Would a faulty sensor give a high temp reading on the indoor controller? Any help would be appreciated. I hate throwing parts at it.

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    Default Re: Inaccurate water temp reading

    Here is a stupid question: Is the pump running when it is 82 degrees? Unless there is water flow, the temp is inaccurate.

    If it is 82 degrees when the pump is running, I would try a new sensor.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    waste is offline PF Support Team Whizbang Spinner waste 3 stars waste 3 stars waste 3 stars
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    Lightbulb Re: Inaccurate water temp reading

    I assume that the air temp sensor is also hooked up and giving you an accurate air temp reading - <quick and dirty> - switch the wiring to the two sensors and check what they're saying. You can also go over to the unit and see what it's saying 'in the box', just to be sure it's not a problem with the remote unit.

    {edit}You can also remove the sensor and check for deposits, cracks etc. - Easy enough with a flat-head screwdriver, but even easier with a 5/16" nut driver (even easier with a 5/16" bit in a cordless drill - but dial down the clutch when retightening it ){edit}
    Last edited by waste; 03-10-2007 at 04:27 PM. Reason: forgot something
    Luv & Luk, Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill libraries

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    Default Re: Inaccurate water temp reading

    Quote Originally Posted by mas985 View Post
    Here is a stupid question: Is the pump running when it is 82 degrees? Unless there is water flow, the temp is inaccurate.

    If it is 82 degrees when the pump is running, I would try a new sensor.
    Yes, the pump is running.

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    Default Re: Inaccurate water temp reading

    Quote Originally Posted by waste View Post
    I assume that the air temp sensor is also hooked up and giving you an accurate air temp reading - <quick and dirty> - switch the wiring to the two sensors and check what they're saying. You can also go over to the unit and see what it's saying 'in the box', just to be sure it's not a problem with the remote unit.

    {edit}You can also remove the sensor and check for deposits, cracks etc. - Easy enough with a flat-head screwdriver, but even easier with a 5/16" nut driver (even easier with a 5/16" bit in a cordless drill - but dial down the clutch when retightening it ){edit}
    Thanks for the response. Good idea about checking the Aquarite display. The Aquarite unit outside is reading the correct water temp,(matches the thermometer in the pool within 1 degree) which indicates to me the sensor is ok. Is there some sort of calibration procedure between the two units?

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    Default Re: Inaccurate water temp reading

    Sorry about the first question but I had to ask.

    The main temperature circuitry is at the main unit outside. The remote display is just that, a display, and does not measure temperature itself. It should have identical readouts to the main unit. It sounds as though the remote unit may have a problem. Try disconnecting it or turning off and then on to see if it can reset itself. You may need to power cycle both units.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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