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The Daily Insight

How does a furnace induction motor work?

Author

Sarah Martinez

Updated on April 03, 2026

A furnace inducer motor is essentially a motor-driven fan, with an electrical box for power connections and metal housing. Your motor should move air through the furnace and heating vent pipes.

Why is my inducer motor constantly running?

A failed limit switch would not cause the inducer to run continuously. A failed limit switch will usually cause the inducer to run and in many cases…. the main blower too.

Why does my furnace have two pressure switches?

Two Stage: If you have a two stage furnace, it is likely that you will have two pressure switches. This is because your furnace has two heat exchangers, requiring each exchanger to have its own switch. Draft pressure switches tend to operate at 24 volts.

When should inducer motor shut off?

Also is the normal cycle of the inducer motor that it starts 1st before the burners and stays on until the main blower kicks off??????? The inducer motor is switched on and should stay on as long as the thermostat is calling for heat. It should switch off and stay off when the thermostat is not calling for heat.

When should inducer motor run?

Simply put, an inducer fan should start up when your thermostat calls for heat. It will do this anywhere from 30 seconds to one minute. It then stays running for as long as your system is heating the house and shuts off when your system cycles off.

What is an inducer motor on a furnace?

An inducer motor on a furnace is a motor that operates the inducer assembly, which is a small fan that pulls heat through the furnace and distributes it to the outside venting. The assembly is typically made of metal or plastic, depending on the AFUE percentage of the furnace.

What is a vacuum induction furnace?

The world’s first vacuum induction furnace was built in Germany in 1917 to melt the engines of aircraft and rocket engines. The vacuum induction furnace is one of the most widely used machines in the field of vacuum metallurgy.

How do you replace a Lennox inducer motor?

Watch the videos mentioned in the text below for specific instructions on how to replace a Lennox Inducer Motor and how to replace a Rheem Inducer Motor. Turn off gas to your furnace and turn off power to the furnace. Remove the panel covering your furnace. Locate your furnace draft inducer, usually found in the upper-left corner.

How to replace the inducer motor on a Kenmore gas furnace?

1 Turn off gas to your furnace and turn off power to the furnace. 2 Remove the panel covering your furnace. 3 Locate your furnace draft inducer, usually found in the upper-left corner. 4 Remove the inducer motor. 5 Align and replace the inducer motor 6 Replace your furnace cover and turn the power to your furnace back on.