Hi - my neighbor has a Goodman Forced Hot Air furnace. It's about 5-7 years old. We're in New England (it's cold here). Over the weekend his furnace started short-cycling and then not-turning on. Increasing air flow (opening supplies, opening furnace cover to improve return) seemed to fix it. Tonight we got it to fail and the flashing LED indicated a high limit failure. The guy who put it in (who's helping him by phone from Cape Cod) says he has a blockage in his ducts. But nothing has changed in his house, and I'm wondering if it couldn't be the limit switch itself. Also, in testing the furnace we noticed that it seemed to struggle to ignite a few times. and when it finally shut off after indicating the limit switch failure and then cooling down, it indicated an igniter failure. I'm suggesting he get someone local to come look at it, but I was wondering if any of you Goodman pros had any advice as well.
note - igniter was replaced a couple of years ago - installer first tried generic one and when that didn't work got (so he says) genuine goodman part.