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Thanks for you all your input, f30. Turned out to be the regulator on the meter after all that. The utility sent a guy out at first who said everything was fine with their meter, but after bashing my head against non-existent furnace problems sufficiently to be satisfied that's not where the...

OK f30, here's the placard on the inside of the door. Interestingly, the 4 blink code on this diagram indicates something different than the manual I found online. This diagram says 4 blinks = ignition failure, nothing to do with the high limit circuit. So I'm wondering now if this is just an...

K, cool, thanks for that f30. I'll confess now to not being a furnace tech. I have some basic electronic and electrical diagnostic capacity, but I'm just Joe Homeowner. I'm going to have to educate myself a little bit about exactly how to test that circuit from end to end to find where it's...

OK all, I have a 2007 Frigidaire furnace that started throwing a 4 blink code, which indicates an open high limit switch according to the manual. So I pulled that switch, measured about 4 ohms of resistance at room temperature, so that all checks out so far. I ordered a new one from Nordyne...