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Fixing Error Code 223 on Your Lennox® Furnace

Feeling a chill because you’re getting 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 run for your protection.

Depend on the Experts at Robinson Service Experts to handle fixing this furnace error. Our ACE-certified technicians are among the best in the industry when it comes to recognizing and repairing furnace issues.

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 an important part of the heating system.

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 pushes out combustion gases from the heat exchanger and pulls in new gas and air so the burners can fire.
  • When the pressure switch senses that sufficient 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 more than one pressure switches, which permit it to run at multiple 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:

  • Blocked vent
  • Plugged 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 something wrong 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 observe fast flashes or an alternating slow flash as it repeats a fault code.

Estimated Repair Cost for Furnace Error Code 223

The price to fix your furnace depends on what’s wrong with it and how long it takes to remedy 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 Robinson Service Experts

When you need furnace service, you can lean on the professionals at Robinson Service Experts to take care of the fault code and get your heat working again.

Call us at 847-306-8730 or schedule an appointment online today.