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The same thing happened a few years ago, replaced the thermostat and that wasn't the problem. So was told to replace the fan limit controller and that fixed it. There is a continuous switch on the furnace, with that switched on the fan works fine. If it is switched to auto the fan won't work.

The fan on my furnace/air conditioner won't turn on and off. If I put it on continuous it works. Tried replacing the fan limit controller but it didn't help. Any help?