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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Error code 126

I have the same problem with my hayward pool heater. It's on - not heating though - i can change the temp up and down but then it immediately displays 126! What's up with that. And the service light does not go on.

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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.

Posted on Dec 08, 2009

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Posted on Jan 02, 2017

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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.

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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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