Clearing Error Code 223 on Your Lennox® Furnace

Getting cold 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 issue, your system will not run for safety reasons.

Turn to the Experts at Service Experts Heating & Air Conditioning to take care of fixing this furnace error. Our NATE-certified technicians are among the elite in the industry when it comes to understanding and repairing furnace issues.

Your satisfaction is important to our team. That’s why we back our furnace repair work in North America with a 100% Satisfaction Guarantee* for a year.

How a Low Pressure Switch Works

Pressure switches are a necessary part of the heating process.

Here’s how your furnace works after the thermostat initiates the call for heat:

  • Your furnace’s control board begins the draft inducer blower motor. This gets rid of combustion gases from the heat exchanger and sucks in new gas and air so the burners can start.
  • When the pressure switch senses that a suitable amount of air is being dragged 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 multiple speeds—and be more efficient.

What Happens When a Low Pressure Switch Malfunctions

The low pressure switch may be open for several reasons.

There could be a:

  • Obstructed vent
  • Stopped condensate drain
  • Cracked hose

There could also be a problem 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 display 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 cost to fix your furnace depends on what’s wrong with it 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 Service Experts Heating & Air Conditioning

When you need furnace service, you can call on the professionals at Service Experts Heating & Air Conditioning to take care of the fault code and get your heat flowing again.

Call us at 866-397-3787 or schedule an appointment online today.