My Goodman furnace is almost two years old. It worked fine last season. I turned the thermostat up last week, and nothing happened. I checked to make sure there was power and the cover was on propertly. I changed the filter and checked the air intake, but still nothing.
When the unit is turned on, the green light flashes repeatedly as if everything is fine. Any suggestions?

Green light flashes///////on what? The tstat? Or circuit board in the furnace?

This is my daughter's furnace I helped arrange to have installed almost two years ago. I put the model number in a search and discovered it is actually a York furnace, Model No. TG9S060B12MP11A.

Installer was looking at both options and recommended the York. You may not want to continue answering, but the green light is on the furnace. She is in another city. I think she is seeing it in a view window.

I downloaded the tech specs and the manual and will send those to her to review. Appears there may be two locations at which you have to be sure the gas is on. We will go through the start-up procedures and see what happens.

Thank you.