Goodman furnace, less than 5 years old.
Ignitor lights up and furnace temporarily runs (less than 5 seconds), and then kicks off.
It doesn't do it every time. Seems like when I set the temperature fairly high after returning home is when this happens most.
Any insight is appreciated.
Remove and clean the flame sensor with steel wool or emory paper. Sits in front of one of the burners and looks like this:
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