Model: 21v30-7p, pilot wont stay lit - Rheem Water Heaters

Is it the Pilot, or the main burner that won't stay lit?

The pilot has a little 'flame rod' in the path of the pilot flame, that conducts a tiny current thru the flame, to a detection circuit-- assuring that there is a pilot flame-- If that rod get's dirty, it can cause false trips. Is that any help?- Mack B

Copy following link for troubleshoot by type of gas control valve
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
Use mirror to inspect arrestor screen.
http://waterheatertimer.org/images/Flame-trap-inspection-325.jpg

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

Most gas water heater problems can be fixed with yearly service that cleans burner and burner parts, checks gas pressure and bleeds air out of gas line, cleans air intake, and checks for venting and air intake problems.
Open following links for resources:
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
http://waterheatertimer.org/pdf/Attic-Ventilation-and-Pilot-Outage-in-Gas%20Water-Heaters.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

there could be a small blockage in the pilot light gas nozzle which just need cleaning

need a new one.(pilot light)

You will need a new thermo coupler to keeep the pilot ight on. It is a probe that touches the pilot flame to sense the the regulator to feed the gas flow. Upon failing it shuts off the gas to the regulator so the unit does not catch on fire. In other words it is a fail safe part that is required

Make sure ALL covers are in place. Watch the pilot flame. It should not move around. If it does, there's a draft blowing it out.

resetting your lock out for richmond power vent

get a long stick match, a flashlight remove lower inspection cover, find thermocouple and pilot light will be next to it,turn gas valve to pilot light and hold down,stick the match in by thermocouple till the pilot lights and hold valve down till pilot stays lit,this may take a minute or more,then release gas valve and see if pilot stays lit, if not retry,if it wont stay lit,the thermocouple is defective and needs replacement

pilot light assembly needs cleaned - the pilot light is not getting enough gas to stay lit- caused by dirt in fuel line to vavle assembly at the point where fuel comes out - you will have to call for service on this one