Furnace Blower Not Working On Auto

A furnace requires proper gas flow to the burner assembly as well as electricity to the thermostat to actuate the heater. However the fan will work when the thermostat is set to the on position. But the motor does not run the motor may be burned out.

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Furnace blower not running.

Furnace blower not working on auto. Any yellow red or orange indicates dust and dirt buildup on the burner. If you have cool air but a steady airflow your blower motor is working but your heat exchanger or burner is not. This video provides information on how to troubleshoot a furnace blower that won t run and the most likely defective parts associated with this problem. When i do turn the fan to the on position no hot air is blowing out of the vent.

Usually when you set your thermostat to auto or automatic the burner will ignite when the temperature falls below the temperature you set on the thermostat. Inspect the heat exchanger for cracks which can cause a safety hazard. Causes for furnace not working with thermostat fan setting on auto. Lennox furnace blower doesn t come on when on auto 5 answers i have a lennox furnace model g23q3 4 100 2.

Just cool air blows. After checking your thermostat s temperature setting ensure that it is in heat mode instead. If this step is unsuccessful continue to check the other possible causes of your furnace not blowing air. If you have a programmable thermostat check that the date and time are correct.

My furnace fan blower will not work when set to the auto position. The blower motor blows air through the return vent past the heat exchanger and into the home s venting. When the thermostat calls for heat the igniter will light the pilot the gas will come on and light but the blower does not come on and the furnace will shut off after a few minutes overheats because of no blower. Check the furnace flame for a complete blue color.

First make sure that power is getting to the motor. I replaced the thermostat and get the same results. If the blower motor is burned out replace it. If power is getting to the blower motor.

Also the furnace is hot and the gas is burning.