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Furance Blower Runs All The Time

The 3 most common part(s) or condition(s) which cause the symptom Furance blower runs all the time are listed below starting with the most likely. Check or test each item and watch any available videos.


Enter your model number for the best repair help results:


To see parts for your furnace, you need to enter your model number on the right. The system will then display parts that are associated with your furnace.

Control Board

If the furnace blower runs all the time the control board might be going bad. The control board has relays on it that control the components of the furnace. If the relay that controls the blower motor fails closed the motor will run continuously.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

To see parts for your furnace, you need to enter your model number on the right. The system will then display parts that are associated with your furnace.

Limit Switch

If the furnace blower runs all the time the limit switch for the blower motor might be going bad. The limit switch closes when heated to turn the blower fan on. If the limit switch fails closed the blower motor will run continuously.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

To see parts for your furnace, you need to enter your model number on the right. The system will then display parts that are associated with your furnace.

Wall Thermostat

If the furnace blower runs all the time the wall thermostat might be going bad. The wall thermostat has contacts in it that control the furnace. If the contact that controls the blower fan motor fails closed the motor will run continuously.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

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