I have a cozy furance model #DVCF635B-H installed in the garage with a two speed blower it only runs in one speed turns off after reaching temperture and starts again at the same speed
There is a small switch attached to the heat exchanger that controls the speeds. Another one to turn the fan on and a third is a high limit switch. They are very inexpensive so it would not be a bad idea to replace all three. You can get a parts breakdown on the net and buy the parts and replace them yourself to save money.
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There is a small switch attached to the heat exchanger that controls the speeds. Another one to turn the fan on and a third is a high limit switch. They are very inexpensive so it would not be a bad idea to replace all three. You can get a parts breakdown on the net and buy the parts and replace them yourself to save money.