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That little filter thingy is actually a "FVR" Flammable Vapor Resistor,it works on resistance, as flammable vapors or (in some case's) Heavy humidity the resistance will increase.
It's designed to trip at a minimum of 75K the intelli vent gas valve circuit will run through it after the pre-purge power vent fires up and it will recognize that the resistance is too high and it will lock out,and will not reset over time......Even when the resistance drops.
Also the FVR can be restored to 55K-65K,if it gets wet place it in a bag of rice or if it has been subject to harmful vapors you can take off the two stake-on wires and slide it onto your car window and go for a cruise and remove the vapors at the unit location.After this you have to reset the unit and no it's not simple there is a 11 step process to it.
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