Why the Carrier Furnace 394GAW036075 Doesn't Turn the Blower on When It Should

Air Filters

• Check the air filter and airflow for your blower. Remove any clogs and open any vents if they have been closed. Carrier suggests this step first, since many functional problems involving the furnace are related to airflow blockages, which can cause a number of issues. Potentially, your fan may be turning but without enough airflow you will not feel the effects around the vents. Cleaning or replacing air filters can also help remedy this issue.

Electrical Issues

• Check your thermostat. If it is not set higher than the room temperature, it will not be sending signals to your furnace, and neither the blower nor the burner will operate. Check the electrical supply for your furnace to see if there is a power switch you need to turn on. Check the blower access door to make sure it is in place. You can also use an ohmmeter to check the wiring for the blower and its motor for more precise troubleshooting.

Blower Problems

• The issue may be the blower itself, especially if only the blower has stopped working while the burner is still working. The fan blades may have become damaged or jammed. The fan belt may have slipped and may need to be replaced in order make the blower functional again. The motor itself may have burned out or may have an electrical malfunction. You may need to buy a new motor as well as new fan blades to restore your blower operation.

Reset Limits

• Your Carrier furnace has reset limits that tell the furnace to shut down operations if the furnace temperature rises too quickly or too high. These sensors can become loose or can malfunction, shutting down your furnace before it gets a chance to turn on the blower. Check your settings on the control panel to see if you need to reset the furnace system or search for a wiring problem.