new water heater problem

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Is it a power vent model or atmospheric discharge?
Also whose' the manufacturer.
You mentioned the pilot goes out at least once a month,is this accurate or is it failing more frequently.

The newer models come with a "fvr" sensor on the milli volt end it called Flammable Vapor Resistor,it will open the circuit when the ohm reading goes above 75k.(from flammable vapors are detected).
These are normally installed on power vent units with an HSI ignition.
Also called glow plugs or Hot Surface Igniters.
As these are a bit tricky to reset it's a multi step process,
or you have a standing pilot, the thermocouple may not be positioned properly over the pilot or you my have flame rod (instead) I've seen this manufacturing defect a 100 times before.
I honestly do not think you have a combustion issue.
Posted from my iPhone/Mobile device

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hi , It's an American Water Co. /pro line flame guard and vented out through the roof the vent is tied in with the gas furnace.
On the average its going out once a month and I vacuum the underneath air inlet my plumber says that air inlet gets dust in it and trips the safety
Thanks for all your input with this
Ml Sr