What should I do if the furnace doesn't start after I install it?
Refer to the Lighting Instructions Label or the “Putting the Furnace Into Operation” section of this manual or installation instructions for guidance on how to use the gas valve's manual ON/OFF control during startup and shutdown periods (Page 20).
From the official Goodman Gm9s96 manual, page 20
Have a follow-up question?
Answers from the official manual.
Common questions