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furnace is going off on high limit
My unicell furnace is overheating. This causes it to shut down. The repairman says "The furnace is going off on high limit. The heat exchanger is getting cherry red and is a fire hazard. The vent and combustion air are too small for the size of the furnace. The furnace is too big for the duct work and should be replaced."
He said its a 120 btu and my house should only need a 75 btu.
The furnace is 11 years old. Do I really need a new one? Can't something else be done? I have had the igniter changed, but that only solved the problem for about 3 weeks.
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