[Rookie21]

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.

Thanks.

 

[yuri]

Remove and clean the flame sensor with steel wool or emory paper. Sits in front of one of the burners and looks like this: