SOURCE: pilot won't stay lit
Possible thermocouple is defective. The thermocouple is heated by the pilot itself, the theory behind this safety design is so the main burner cannot come on, if the thermocouple won't stay hot, it reduces the chance for a huge gas buildup in the burner compartment and possible explosion.
I have also seen cases a pilot would not stay lit if the flue for the heater is blocked by a spider web, bird nest or other obstruction.
Check and make sure the flue/vent is absolutely clean and clear, if it is, then the thermocouple may be defective. If you have an electric pigtail on the thermocouple, the problem may be the electronics or circuit board.
Here is a link to a photo of a thermocouple
https://www.centraltrailer.com/cart/images/2631-3481.jpg
Testimonial: "It was a bad thermocouple on an 8 month old water heater. Mfgr sent a replacement. I installed. Problem solved. Thanks for your help."
SOURCE: WHY WON'T THE PILOT LIGHT WON'T STAY LIT?...
Thermocoupling may be bad or need to be cleaned.
SOURCE: water heater pilot light will not stay lit
Probably the thermocouple.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#pilot
http://waterheatertimer.org/How-to-test-water-heater-thermocouple.html
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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