American H20 co. Is a sub division of A.O.Smith,
The flame guard series have 2 or three black vinyl screens that slide/ friction clip that are about 1.5" in height and 12-14" in length these fit into the bottom perimeter of the tank.there perpouse is to collect the dust from the surrounding area.
Salthart has a good point,about the valve being faulty,
If the thermocouple is fine and sending a milli volts signal to the gas valve then the ECO Emergency Cut Off us failing.
This would take about five mins. to diagnose with a couple of simple tools, voltmeter 3/8",1/2" 7/16" box wrench.
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