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Resolving Error Code 223 on Your Lennox® Furnace

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

This is telling you your furnace’s low pressure switch is open. Due to the malfunction, your system will not work for your protection.

Trust the Experts at Stevenson Service Experts to handle repairing this furnace error. Our ACE-certified technicians are among the brightest in the industry when it comes to recognizing and repairing furnace problems.

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 acts after the thermostat initiates the call for heat:

  • Your furnace’s control board begins the draft inducer blower motor. This pushes out combustion gases from the heat exchanger and brings in new gas and air so the burners can fire.
  • When the pressure switch senses that enough air is being dragged into the burners, it closes and tells the control board to ignite the furnace.
  • Your furnace ignites and heats your house.

A two-stage furnace has a few pressure switches, which help 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 several reasons.

There could be a:

  • Obstructed 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 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 see fast flashes or an alternating slow flash as it reiterates a fault code.

Estimated Repair Cost for Furnace Error Code 223

The expense to fix your furnace depends on the root problem48} and the time it takes to repair 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 Stevenson Service Experts

When you have to have furnace service, you can call on the professionals at Stevenson Service Experts

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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