Question about Sta Rite STA-RITE CONTROL BOARD KIT - 42001-0096S

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Water Temp on heater reads 126 degrees F

I have a SR poolHeater model SR400NA the water temperture reads 126 degrees F at all times therfore the heater won't turn on. I was thinking it might be the thermistor but didn't want to buy one until I was sure that was the problem.

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I am not sure if you have resolved this issue, or not, but just in case. Yes, the problem is the Thermistor. This is a sensor that "reads" the incoming water temp. It is really easy to replace as well.

Posted on Jul 09, 2009

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When turning on power display reads 128 then error code r 13, after this it say's spa on but the temp reads 126 and the water temp is only about 68 so the heater never comes on.


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The heater won't fire and water temp reads 114 degrees. I've replaced the thermistor with no luck.


If the temp reads 144, the heater will not fire because it thinks the water is 144 ... entirely too hot and way beyond the safety limit of this heater.

I believe your trouble is in the thermostat sending unit.

Let me know what happens when you check this sensor.

Thanks for using FixYa.com

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Dec 05, 2009 | Sta Rite Sr400na Max E Therm Pool & Spa...

1 Answer

My spa heater is saying the spa is 126 degrees so


Use a thermometer to check the actual temp of the water to see if the units temp probe is accurate. Also what is the max temp allowed by the spas safety program...owners manual.
Thanks,
RSMITH972278

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1 Answer

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1 Answer

Sta-rite heater error code 126


The 126 is not an error code, but it maybe the temp of the water that the heater is reading. If the heater thinks the water is 126 degrees, it will not start at all.

If the heater is reading the wrong water temp, the problem is the Thermister, which is the sensor that is suppose to read the water temp. You will need to replace this sensor in order to correct the problem with the heater. It is really easy to do!

If you have a manual for the heater, if you go to the Replacement Parts Listing for the Electrical System, page 53 in the online version, the Thermistor is Item #9. It goes into the left side of the manifold in the to place, between the first two manifold bolts.

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This is a bad thermister or heat sensor. It mounts in your water manifold and if it goes bad no error will show. The bad sensor is telling the heater that the water is to hot and it wont let the heater fire. This is a farley inexpensive part and easy to change out. With a new one it should read the proper temp and call for heat then fire the heater. Good luck.

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Anytime the heater is reading the water temp to be above what it actually is, especially 126, the problem is the Thermistor, or Temp Sensor, for the heater. This is a very easy part to replace. The Thermistor is located on the manifold, on the left side, between the top two bolts.

Sorry this is a late response! Hope that it helps!

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