Our furnace was installed new 6 years ago. It's a Coleman model TG8S080B12MP11A. Our HVAC guy who installed it claimed it was an awesome furnace (his words). Well, he was wrong! This is the most unreliable POS I've ever seen. Every winter we have to deal with this thing constantly going out on us. It has a light on the main circuit board that flashes rapidly when there's a fault to indicate what the problem is. It goes out quite regularly because of the flame sensor, which is nothing more than a wire that sets inside the combustion chamber. I can take this sensor out and clean it and then it will work for a while, and then it starts faulting out again. Even replacing the sensor with a new one only works for a week or two before it starts faulting. When it goes out, the furnace runs constantly, blowing cold air, and wasting electricity. Last year we had to have the main circuit board replaced because we kept getting an error for an open limit switch, and now I'm getting that error again too. With my work schedule that has me away from home for 2 weeks at a time and my wife here alone, and temps lately being in the single digits, I can't have an unreliable furnace. Do I have any other choice other than having to replace the entire furnace?
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