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Thread: Thermal Regulator problems

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    Thermal Regulator problems

    This is the second time in the past year I have needed to replace the thermal regulator (thermostat) in my Sta Rite MaxETherm.
    This is used on a ~1200 gal. saltwater in ground spa.

    This one is 6 months old. They have rarely lasted past 1 year.

    Here's the one I just pulled. You can see the crack in the center shaft and it is completely frozen.

    [attachment=0:mik7pnhz]ThermReg1.JPG[/attachment:mik7pnhz]

    I thought I kept very close eye on my water chemistries but clearly there is something not right. Is there a specific thing like ph or hardness that might be accelerating this problem? Can anyone offer any advice on how to get these things to last longer or can I just leave it out. It's become a bit of a PITA.

    The heater works well without it right now- no error codes!!!
    Attached Images Attached Images

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    Join Date
    Mar 2007
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    Coastalish 'down easter'
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    Re: Thermal Regulator problems

    Welcome to TFP!!

    It certainly looks like something's wrong.

    The color doesn't look right, so I suspect a chemistry issue.

    Can you post some test #s and tell us how you came by them?
    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 a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    Re: Thermal Regulator problems

    Thank you waste!
    I am glad I came across this forum. Lots of very knowledgeable people and good info to be found.


    The pool is exposed aggregate.
    I find I need to add acid often due to the pH continually drifting upward.

    Here is a snapshot from today: (I dropped this off at the local pool store for a complete analysis, it's usually pretty close to what I get)

    TC: 5 ppm
    FC: 5 ppm
    pH: 7.8
    AD: 1
    TA: 85 ppm
    CH: 215 ppm
    Stab: 30 ppm
    Salinity: 3200 ppm

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    Ohm_Boy's Avatar
    Join Date
    May 2007
    Location
    Orlando, FL
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    1,344

    Re: Thermal Regulator problems

    Odd.
    To me, that "thermal regulator" sure does look a lot like an automobile cooling system thermostat. On my truck, one of those has lasted for pretty near to 20 years in the ralph-awfulest mess of liquids similar to water with a wide range of antifreeze dilution and some varying consistency lumps of rust and stopleak, over temperatures from freezing to around 230*F with absolutely no consideration for ph or calcium or algae, and while it may fail tomorrow, it hasn't batted an eye yet. I cannot imagine what might could cause that kind of split.
    [center:1kpalu48]Helpful Links: Pool School | CYA/Chlorine Chart | Pool Calculator[/center:1kpalu48]

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    Mod Squad Bama Rambler's Avatar
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    Re: Thermal Regulator problems

    You're not pouring the acid in the skimmer are you? Just asking!
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  6. Back To Top    #6

    Re: Thermal Regulator problems

    Good question, Bama!

    I usually pour it on the opposite side of the spa from the skimmer near a jet to get it dispersed well before going into the skimmer. Usually needs only about an ounce every few weeks.

  7. Back To Top    #7

    Re: Thermal Regulator problems

    Quote Originally Posted by Ohm_Boy
    Odd.
    To me, that "thermal regulator" sure does look a lot like an automobile cooling system thermostat. On my truck, one of those has lasted for pretty near to 20 years in the ralph-awfulest mess of liquids similar to water with a wide range of antifreeze dilution and some varying consistency lumps of rust and stopleak, over temperatures from freezing to around 230*F with absolutely no consideration for ph or calcium or algae, and while it may fail tomorrow, it hasn't batted an eye yet. I cannot imagine what might could cause that kind of split.
    That's exactly what it is, only a lot smaller. I don't know why they corrode so quickly but salt water may be a different animal from antifreeze???

  8. Back To Top    #8

    Re: Thermal Regulator problems

    Spoke with the Pentair/Sta Rite tech today.
    His opinion is that high pH is to blame for the repeated malfunctions of the TR.
    pH does drift up to 7.8-7.9.
    Skeptical but I will try to control it more tightly and see if that makes any difference this time.

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