Fv sense problem code

FV-Sense Reset Sequence:
Whirlpool water heater M# PCG2J4040T3NOV 102
Should the FV-Sensor of this water heater detect the presence of flammable vapors the following FV-Sense Reset Sequence must be entered into the Electronic Control Display. NOTE: "BEFORE RESETTING THE FVIR SENSE IN THE ELECTRONIC CONTROL DISPLAY, THOROUGHLY INSPECT THE AREA AND REMOVE THE SOURCE OF THE FLAMMABLE VAPORS".
1. Manual reset is accomplished by first turning off the power to the water heater for at least 10 seconds.
2. Then, while pressing the two temperature adjustment buttons on the display, turn the switch on the gas control valve/thermostat to the on position. All the display icons will start to flash. Temporarily release both temperature adjust buttons and within 2 seconds, press both temperatures adjust buttons again until all the display icons are on steady. Release the two temperature adjust buttons. The system will clear the fault, perform a reset, and normal operation will be restored.

Type of gas control valve is not known.
Brand of water heater is not known.
FV event can mean that air intake is clogged, gas control valve has gone bad, or FV system has tripped, or TCO has tripped ... or all of above.
Clean air intake, download manual from manufacturer and read troubleshoot section, call manufacturer.
Copy following links for troubleshoot resources
http://waterheatertimer.org/How-to-repair-Rheem-FVIR.html
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
http://www.thetankatwaterheaterrescue.com/forums/forum3/

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