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This is a generic flame failure error. The most likely cause is a dirty/oxidized flame sensor. If you're comfortable working in the combustion chamber you can clean of the metal rod of the flame sensor (see attached picture for typical) with steel wool or aluminum oxide sand paper. Also vacuum out the chamber since debris, particularly rust flakes, can ground out the sensor causing a lockout.
Technically yes, but as a practical matter it's not that critical and you can usually reuse the existing gasket unless it's totally destroyed. The only reason for this gasket is to isolate the combustion chamber from flammable vapors should they find their way to the heater. We seemed to have managed just fine for many decades without sealed chambers but now it's a big deal.
If you plan on cleaning the sensor be aware that the gap spacing between the burner and sensor is critical. So take care to not move it out of position.
Also check the position of the sensor. The tip should be 1/2" from the edge of the burner and 1/32" above it. The next step is to replace the flame sensor. If neither works then replacing the gas valve is next.
I posted a picture earlier. Here it is again. It not bent the same way as the one in the pic. I hope you didn't clean the igniter next to it.
Your best bet is a local plumbing supply house that sells Rheem heaters
I don't see the need for a new burner unless yours is badly corroded. I've never replaced a burner in 40+ years in this business. However replacing the sensor is the next step.
If you have the sensor positioned properly then the next likely culprit is the gas valve. Looks like your heater may be under warranty if it's less than 6 years since it was installed
If you have an invoice the warranty runs from install/purchase date not manufacturing date. As far as I can tell yes $28 but I don't get paid unless you rate me favorably. Payment questions should be directed to customer service. I only answer plumbing questions.
It just unscrews from the tank after you drain it and disconnect the tubing to the burner.