My Rheem Power vent LP water heater goes into lockout mode for the last several mornings. I cycle the power and it works for the entire day, then locks out again by morning. This unit was just installed in January.
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Air intake is probably clogged, so combustion air flow slowed and caused overheating inside combustion chamber. This tripped FV system and broke TRD, which is a small glass vial located under burner. The spring-activated air baffle snapped closed and shut off air supply, and also tripped FV lockout of gas control. Remove burner, replace glass vial ordered from Richmond, and clean air intake. http://waterheatertimer.org/How-to-repair-Rheem-TRD.html If you have Intellivent gas control, then it can be reset. Copy following link to identify gas control valve, and download possible service manual: http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
Have you cleaned the air intake located under combustion chamber, and inspected for broken glass vial? Rheem FVIR system uses glass vial that breaks if combustion air is slowed, and resulting combustion causes slow-moving venting of hot gasses, causing overheating that breaks glass vial. http://waterheatertimer.org/How-to-repair-Rheem-FVIR.html
Start-point is to inspect and clean burner parts and combustion chamber, clean air intake, bleed air out of gas line, test gas pressure, test electronic gas control valve, check for venting issues. As general rule, gas water heater manuals recommend professional service once a year that would cover most items listed above. To see images, and for more reading and resources, look at your product manual and open following link: http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean
I believe the 21VP is older and Rheem does not show older manuals, but manuals are generally generic enough to help greatly. Year of manufacture show as second and third digit of serial number.
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