Clearing Error Code 223 on Your Lennox® Furnace

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

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

Depend on the Experts at Teays Valley Service Experts to handle mending this furnace error. Our ACE-certified technicians are among the best in the industry when it comes to diagnosing and repairing furnace problems.

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

How a Low Pressure Switch Works

Pressure switches are an essential part of the heating system.

Here’s how your furnace works after the thermostat begins 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 fire.
  • When the pressure switch senses that enough air is being pulled into the burners, it closes and triggers the control board to ignite the furnace.
  • Your furnace ignites and heats your house.

A two-stage furnace has several pressure switches, which allow it to run at various speeds—and use less energy.

What Happens When a Low Pressure Switch Malfunctions

The low pressure switch may be open for a variety reasons.

There could be a:

  • Obstructed vent
  • Plugged condensate drain
  • Cracked hose

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

Your furnace will let you know there’s an issue with a red flash from its indicator light, which it uses to exhibit error codes. It has this red light to flash code, like Morse code.

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

Estimated Repair Cost for Furnace Error Code 223

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

Here are average 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 Teays Valley Service Experts

When you need furnace service, you can trust the professionals at Teays Valley Service Experts

to handle the fault code and get your heat flowing again.

Call us at or schedule an appointment online today.

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