Some time ago I had that happen and because of the age my repair man said it would cost too much to repair it. The problem was a worn out thermostat.
SOURCE: Natural gas hot water heater not stying lit
Probably a bad solenoid in the gas valve. Higher voltage of a new thermocouple keeps it open longer but it still fails over a period of time. Look into a new gas valve for the water heater.
SOURCE: pilot light on water heater wont stay lit
The thermocouple has failed. It is the temp probe that goes from the pilot lite burner area to the control valve. Go to your local plumbng repair shop and buy one. Most appliance parts stores have them also. Take the old one with you and they will hook you up with an exact replacement. They are not that hard to change. Usually a nut or 2 screws in the temp bulb area at the burner end and a nut that threads into the control valve.
Make sure before you install the new one that the area where it mates to the gas valve is clean. Should be about a 20 min job including clean up with replacement parts in hand.
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SOURCE: pilot light won't stay lit on new water heater
1) Get more air to the water heater and see if problem continues.
2) Read the following pdf-s for things that might apply to your situation.
http://waterheatertimer.org/images/Negative-pressure.jpg
http://waterheatertimer.org/pdf/Attic-Ventilation-and-Pilot-Outage-in-Gas%20Water-Heaters.pdf
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
3) Read pdfs above first, and then Add a comment with missing information below, for possible do-it-yourself help.
Does this water heater have a blower?
Is gas valve electronic? Or does gas valve have a dial?
If gas valve is electronic, have you checked outlet with circuit analyzer?
Did pilot light work correctly for a while? If so how long?
Where is water heater located? Hot attic? Closet? Garage? Is area dirty and dusty? Has air intake been cleaned?
What color is pilot flame? Clear blue or yellow-or-orange?
Have you inspected inside of combustion chamber for dripping water?
SOURCE: Lowe's hot water heater pilot light will not stay
Hi,
If it is one of the new ones with the fancy gas control and the blinking light... does the light blink?? or not??
If it is blinking then the pilot should stay lit...
If it will not blink then the sensor is bad or not in the right place...
Or... the gas control is bad... this is happening alot...
If it is brand new... take it back...
heatman101
SOURCE: pilot light won' stay lit on water heater
Open following link to identify specific gas control anddownload possible service manuals for that specific product.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.htmlIt is possible that air intake is dirty, or combustion partsneed cleaning, or gas control valve is bad, or gas pressure is low.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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