Yes, the igniter is next up. If it doesn’t glow there is no call to the gas valve. It will cycle three times trying to light. On the 3rd failed attempt it typically shuts off for anywhere from 4-6 hours or Until reset, Depending on the dip switches respectively. You can Test the board where speed terminals connect the igniter for voltage ; Or if you don’t have a voltmeter unscrew the screw, remove the igniter and plug it up to 110 power source/wall receptacle to see if it glows. Be careful, AND DO NOT TOUCH THE CARBON ROD OF THE IGNITER WITHOUT LATEX OR NITRIL GLOVES. The oil from your skin/fingers will deposit onto the igniter and it will cause it to fail and fracture next time it lights up. If it works that is lol.

I had this problem and it was the igniter. The previous owner of my house actually had told me this had happened to him once, and he told me he left me a spare igniter and showed me how to replace it. I took a video of him showing me, that I ended up needing to reference just a few years later. I went the next day and bought a new spare igniter and I’ll always have one on hand because of this.