Clearing Error Code 223 on Your Lennox® Furnace

Feeling a chill because you’re noticing error code 223 from your Lennox® furnace?

This indicates your furnace’s low pressure switch is open. Due to the malfunction, your system will not run for your safety.

Turn to the Experts at Stallion Heating and Air Conditioning to handle repairing this furnace error. Our ACE-certified technicians are among the brightest in the industry when it comes to understanding and repairing furnace troubles.

Your satisfaction is critical to us. That’s why we back our furnace repair* for a year.

How a Low Pressure Switch Works

Pressure switches are a necessary part of the heating operation.

Here’s how your furnace starts after the thermostat starts to call for heat:

  • Your furnace’s control board begins the draft inducer blower motor. This exhausts combustion gases from the heat exchanger and pulls in new gas and air so the burners can ignite.
  • When the pressure switch senses that a suitable amount of air is being pulled into the burners, it closes and triggers the control board to ignite the furnace.
  • Your furnace ignites and heats your home.

A two-stage furnace has a few pressure switches, which allow it to run at multiple speeds—and be more efficient.

What Happens When a Low Pressure Switch Fails

The low pressure switch may be open for several reasons.

There could be a:

  • Blocked vent
  • Clogged condensate drain
  • Cracked hose

There could also be an issue with the switch itself, the inducer or the circuit board.

Your furnace will tell you there’s a problem with a red flash from its indicator light, which it uses to display error codes. It has this red light to flash code, like Morse code.

You might see fast flashes or an alternating slow flash as it replays a fault code.

Estimated Repair Cost for Furnace Error Code 223

The price to fix your furnace depends on the root problem48} and the hours it takes to fix it.

Here are the usual replacement costs for several components that could be affected:

  • Pressure switch—$40 to $350
  • Inducer—$600 to $1,500
  • Circuit board—$200 to $600

Call the Experts at Stallion Heating and Air Conditioning

When you have to have furnace service, you can lean on the professionals at Stallion Heating and Air Conditioning

to work on the fault code and get your heat flowing again.

Call us at or schedule an appointment online today.

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