Goodman furnace - works most of the time. Then, it will give the one-blink indicator of ignition failure. We either wait for it to cycle (which can take 30m-1hr) or turn off the power to the furnace and turn it back on which works.
This is odd. 80% of the time it is working properly. Then, why wouldn't it? I've stood in front of it - motor runs, gas is flowing and it won't ignite. My only guess is flame sensor or ignitor, which I'm leaning towards ignitor.
QUESTION: I thought ignitors are either working or their not. Thoughts?
UPDATE: Thank you for the replies thus far. This seems to happen most often in the morning, rather than mid-day or at night. Lately it kicks on for a little bit in the morning on first run then stops and cycles with the one blink. Turning the furnace off, then on, then adjusting the thermostat tends to get it to work and it'll work all day. Lately the next day it repeats itself.