Nothing says Happy Thanksgiving like a dead mouse in your furnace filter.
That's not what killed the furnace today though. A quick call to a furnace repair place with the LED diagnostic code, screw driver, and a couple Tim Allen 'More power' chants, and I had a working furnace again.
Lots of TTL based chips on a simple little breadboard on these Goodman furnaces, which I think got bought out by Amana. 6 LED flashes meant it had an open blowout (?) apparently. Resetting the switch on the blower did the trick, for about a half hour. After it had done that a few more times, which meant dismantling the whole side of the furnace each time, I made a 1am trip to Meijer's to get a replacement filter.
For being Black Friday, the place was empty, but I think the official sales don't start until 6am, which I'm thankful for. I try to avoid going out on the day after Thanksgiving. I'd much rather cocoon like a bargain basement Howard Hughes.
According to Consumer Reports, Goodman is on the bottom of the list for furnace reliability. If this *year old* furnace keeps breaking down (this is the 3rd time in less than a year), I'm biting the bullet and getting a different brand of furnace. Unfortunately, this is the furnace that came with the house. A brand new house. It is still under warranty for now, but I don't want to be stuck with a lemon and make these late night holiday emergency trips. It's supposed to be 96.6% efficient but I'm more concerned with "uptime" at this point.
I learned quite a bit about HVAC in the process, at least.