![]() ![]() Inspect the heat exchanger for cracks, which can cause a safety hazard. Any yellow, red or orange indicates dust and dirt buildup on the burner. Check the furnace flame for a complete blue color. If you have cool air but a steady airflow, your blower motor is working but your heat exchanger or burner is not. A furnace blower motor that stops pushing warm air out is not the same as a blower that is forcing only cold air into your home. If after trying those three steps you still are not warm, you need to feel the difference between cool airflow and no airflow. A clogged filter can drop airflow so much that your home’s ductwork shakes or your furnace overheats without sending the heat into your home. It should be cleaned or replaced monthly during the heating season. If set too low, you may be cold but your furnace thinks everyone is cozy at 50 degrees.
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