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Clearing Error Code 223 on Your Lennox® Furnace

Getting chilly 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 failure, your system will not run for safety reasons.

Trust the Experts at Coastal Service Experts to deal with repairing this furnace error. Our ACE-certified technicians are among the brightest in the industry when it comes to recognizing and repairing furnace troubles.

Your satisfaction is essential 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 process.

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

  • Your furnace’s control board begins the draft inducer blower motor. This exhausts 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 space.

A two-stage furnace has a few pressure switches, which help it to run at multiple speeds—and use less energy.

What Happens When a Low Pressure Switch Acts Up

The low pressure switch may be open for a couple 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 let you know 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 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 the root problem and the time it takes to fix 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 Coastal Service Experts

When you require furnace service, you can trust the professionals at Coastal Service Experts to work on the fault code and get your heat working again.

Call us at 912-208-2399 or schedule an appointment online today.

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