New ignigtor 1 month ago. 6 year old gas furnace, starts normally, runs for a minute (or less), the gas flame goes out and the fan runs until unit has cooled
There are several things that control the gas valve. A bad flame sensor could cause the valve to shut off upon initial ignition because it's not sensing the flame.
The high limit sensor would shut the unit down only after the unit was runnung for a period of time. It senses the temperature of the heat exchanger. Now if it was bad it wouldn't allow the gas valve to open for ignition.
the only other issue could be with the induced draft blower motor not running.
It it seems to me that the flame sensor is the problem because of the short time your unit runs.
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It was a dirty flame sensor. Located adjacent to the ignitor, it was shightly charred. A light cleaning w/ fine grit sandpaper and now everything is good.
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