Question about Sta Rite Sr400na Max E Therm Pool & Spa Heater Dual Electronic Ignition Lo Nox 400,000 Btu Natural Gas

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Water Temprature read 126 on heater and will not fire. Pool temp @ 72 degrees. Heater set for spa @ 101 degrees. SR400NA Sta-Rite Heater

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  • Dale Cobb May 11, 2010

    sounds like you have a bad or damaged temperature sensor. Have it tested and/or replace it. Is this connected to an automation system such as the pentair easy touch?

  • Anonymous Mar 15, 2014

    when the pump turns on and water starts to flow it reads 126' and won't fire up. I have the spa set at 102'.

  • Scott Corey-reid Apr 15, 2014

    problem is with the thermister

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This is a problem with your thermister (heat sensor) You will find this on the left side of the water manifold about half way down. I'm not sure but I think it is a small tube that slides into the manifold and if you follow the wires back to the board it just plugs in. The part is reasonable priced for a heater part and very easy to install. Good luck.

Posted on Dec 21, 2009

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1 Answer

Sta rite pool heater


Good SHOT! That's likely to be the problem - that or a poor connection.

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Sta Rite SR400NA heater is about 3 yrs old. started once this spring and ran for a couple hours to heat pool slightly. 3 months later and trying to start it up and it will not do anything. read out says...


This is a common problem and easy to fix. Your temp sensor screws into the front side of the water manifold. You will just get a new one and swap it out. Your book will show you just where it is, but it's the size of a 1/2" plug on the top front of the manifold when you take the cover off the heater. Good luck.

Sep 19, 2010 | Sta Rite Sr400na Max E Therm Pool & Spa...

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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

Water Temp on heater reads 126 degrees F


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.

Jun 29, 2009 | Sta Rite STA-RITE CONTROL BOARD KIT -...

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.

Jun 22, 2009 | Sta Rite Sr200lp Max E Therm Pool & Spa...

1 Answer

Error code 126


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.

Jun 17, 2009 | Sta Rite Sr400na Max E Therm Pool & Spa...

1 Answer

Sta Rite Sr333na Max E Therm Pool & Spa Heater gauge stuck?


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!

Apr 10, 2009 | Sta Rite Sr333na Max E Therm Pool & Spa...

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