Carrier furnace with spark but no pilot
Here's a clarification on the original post. When I cleaned the old spark igniter and gas orifice the problem WAS NOT solved. It still randomly locked out. That's why I replaced those items. But that did not solve the problem. Even with the new safety switch and spark igniter it still has a problem that it had before, and it's the one that many people talk about on message boards. That is, the spark igniter may click away for minutes before lighting the pilot. If I put a match to it when its doing this the pilot will light immediately. Like I said, when I unplug the igniter lockout control, and plug it back in, it sparks and lights the pilot immediately. Doing this to the igniter lockout control board seems to reset it to a state where it sends enough power to the spark igniter to light the pilot without hesitation but for some unknown reason it fails to do so on one of the next several startups.