Could be correct, or you may have something in your fan that either fell into or crawled into your fan through the exahust duct.Since you have a service contract, have they actually been out to look at it or did they tell you that on the phone. It might be worth removing the fan and clear any forign matter. The problem is the labor to do that would be the same as to replace it. What does your service contract cover??
If the vents do not come on, have a friend stand by the furnace. Turn off the heater, then turn it on again. Your friend should hear a loud click from the relay after you turn the thermostat on. If there is no sound of a relay clicking, the thermostat is probably broken. good-day !
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