Question about Sta Rite STA-RITE THERMISTOR - 42001-0053S

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I have a bad Starite Pool heater 42001-0053S thermistor that is reading 126 deg F and will not allow my heater to come on. I have a bunch of people over for a party and I need a way to bypass the thermistor so it will allow the pool heater to come on and stay on. This is just a temporary solution until I can replace the Thermistor. Is there a jumper I can put in on the control board to force the heater on and ignore the thermistor bogus high reading?

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  • munymgr Oct 24, 2010

    The manual says the K1 relay supplies 24VAC to J2-Pin1, which is the "Call for heat". After that happens the signal continues on through the rest of the safety switches. To bypass (temporarily) the thermistor, you should be able to jumper 24 VAC to pin1, J2. Does anyone know an easily accessable point in the control board where I can get 24 VAC if the heater is on, but the thermistor is reading 125 deg? If I shunt this to J2-P1, it should initiate the cycle as a call for heat like K1 was closed. Again, I just need this for a few hours to heat up the pool for a party today. I can't get a thermistor on Sunday.

  • munymgr Oct 24, 2010

    If only it were that easy. When you short the to wires, or open the circuit by disconnecting them, the reading is still 125 deg. If I knew the resistance in ohms needed for the thermistor to read a low setting (like 65 degrees) then I could get a resistor at Radio Shack and connect it temporarily to the leads. Any Idea what resistor value it needs?

  • munymgr Oct 24, 2010

    Solutions were no help. You can't just short the wires. You have to have a specific amount of resistance between the terminals. I bought resistors and found the value myself. I would like a refund. The site was no help to me in solving this problem.

  • CheeseandRice Feb 02, 2012

    HAHA. I put in a 100K potentiometer from radio shack that way I could adjust the temp to what my external pool thermometer says. It is a very good hack, but not recommended unless you are monitoring your heater regularly, you dont want it heating out of control. This is just until my 42001-0053S replacement gets here via slow mail. Mine was all scaled up cause the previous owner had a major PH problem cause he ignored the pool, yuck.

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The best way to bypass the thermostat is to short its two wires, if there are only two wires going into it.

Posted on Oct 24, 2010

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Unscrew thermistor and plug hole. I used a plumbing threaded plug. Put thermistor thin end in a cup of ice water. Don't submerge the wire connected end. This is temp solution. Heater won't turn off so watch pool water temp.

Posted on May 26, 2014

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THER IS no repair for that part and if read out is 126 deg i would change the thermistor and this should correct the problem .. this things do go bad.. m m (MAJIC **** )

Posted on Oct 24, 2010

  • dennis dodge Oct 24, 2010

    you have better info than i do on this end and i think you understand the controller . but if you use the wrong value it could mess up the board. . and there costley .. jumping the board is not the ans. .. if heater is need i would disconnect it from the electrical system and power it by itself. this will get the heater heating and you won't damage the board . mm /

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