Resolving Error Code 223 on Your Lennox® Furnace

Getting cold because you’re noticing error code 223 from your Lennox® furnace?

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

Trust the Experts at Stevenson Service Experts to handle mending 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 essential to our team. That’s why we back our furnace repair* for a year.

How a Low Pressure Switch Works

Pressure switches are an important 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 pushes out combustion gases from the heat exchanger and brings in new gas and air so the burners can ignite.
  • When the pressure switch senses that a suitable amount of air is being dragged into the burners, it closes and signals the control board to ignite the furnace.
  • Your furnace ignites and heats your house.

A two-stage furnace has several pressure switches, which help it to run at different speeds—and use energy more efficiently.

What Happens When a Low Pressure Switch Fails

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

There could be a:

  • Obstructed vent
  • Stopped condensate drain
  • Cracked hose

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

Your furnace will show you there’s a problem with a red flash from its indicator light, which it uses to feature 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 price to fix your furnace depends on what’s wrong with it48} and the hours it takes to repair it.

Here are expected 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 need furnace service, you can trust the professionals at Stevenson Service Experts

to take care of the fault code and get your heat working again.

Call us at or schedule an appointment online today.

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