My White Rodgers Gas Valve 37C72U keeps going out. It burns well for ten to twenty minutes and then just shuts off. It lights first press but goes out again after the above time. All flames appear good. Can I adjust the pilot flame size?

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http://waterheatertimer.org/How-to-light-gas-water-heater.html

Gene
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http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

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Clean air intake/ flame arrestor?
Check gas pressure
Bleed gas line

Gene

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Bad gas control valve? Wrong gas control valve for water heater?
This is a dangerous condition... immediate repair needed ... fire and explosion hazard.
Call plumber... or replace heater
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

http://waterheatertimer.org/How-to-install-gas-water-heater.html

Gene

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Reset for intellivent is pressing both arrows simultaneously:
Copy following link for troubleshoot resources:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
http://www.thetankatwaterheaterrescue.com/forums/forum3/
Gene
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Please contact a professional.

Use troubleshoot manual on following link, and then Replace intellivent gas control:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

You have AO Smith tank-type power vent water heater with FVIR flame arrestor.
1) I believe this system has White Rodgers intellivent gas valve, with led indicator lights.
To test if valve is operational:
-NORMAL operating mode displays no lights on gas valve.
-Unplug unit from electrical outlet and plug back in. All lights on gas control should display for 1-5 seconds.
-Press BOTH Hotter and Colder temperature buttons for one second to 'wake up' the control, and release buttons and LED will display temperature.
-Press Hotter or Colder and see if any indicator light shows on gas valve.
This will give baseline if gas valve is functioning.
-Intellivent gas valve requires outlet that is wired 100% correctly. Test outlet with circuit analyzer.
-Water heater must be properly grounded for intellivent to operate.

2) Open following link to identify gas valve and download possible service manual with error codes and testing procedure. Service manual is a large file and will probably not load on dial-up.
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html#intelli

3) Open following link for AO Smith manuals and service handbooks.
Shows same intellivent service manual, and shows manuals for power vent, but does not specifically list the GPS75 series
http://www.hotwater.com/resources/product-literature/service-handbooks/

4) Take a moment and rate answer:
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Water heater and gas valve are not clear:
Add a comment with description of water heater and gas valve for possible help.

Open following link for White Rodgers intelli-vent gas valve thermostat:
http://waterheatertimer.org/pdf/Intelli-vent-gas-valve2.pdf
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html#Intellivent

1) Typical instructions for Kenmore and AO Smith water heater with Intelli-vent say:
Set on-off switch to ON position.
Hold down both arrow buttons for 1 second.
Then press hotter button.

2) Also check that 120Volt electrical outlet has power, and check outlet with cheap circuit analyzer from home center.
3) If Intelli-vent gas valve thermostat is malfunctioning, and won't reset, then contact manufacturer of water heater for replacement gas valve.
Label on side of tank will have Model number, manufacturer, type of gas LP NG, serial number for part ordering.

Add a comment for more help.

the white rodgers gas control needs to be replaced;
the way it works is: the thermocouple opens the pilot gas circuit and, holds it open
when it heats up by creating a magnetic field in the gas control then: when you turn
the knob on the gas control to "on" a valve inside the gas valve opens the main gas circuit and, electricity supplied by your RV keeps it open.
the main gas coil inside the gas valve is defective and, can not hold the main gas circuit to the burner open anymore.