Clearing Error Code 223 on Your Lennox® Furnace

Feeling a chill because you’re noticing 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 run for safety reasons.

Turn to the Experts at Stevenson Service Experts to deal with repairing this furnace error. Our ACE-certified technicians are among the brightest in the industry when it comes to diagnosing and repairing furnace issues.

Your satisfaction is critical to our business. 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 works 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 sucks in new gas and air so the burners can fire.
  • When the pressure switch senses that a suitable amount of air is being brought 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 a few pressure switches, which help it to run at various speeds—and use less energy.

What Happens When a Low Pressure Switch Acts Up

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

There could be a:

  • Closed off vent
  • Clogged condensate drain
  • Cracked hose

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

Your furnace will let you know there’s a problem 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 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 it48} and the hours it takes to remedy 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 have to have furnace service, you can call on the professionals at Stevenson Service Experts

to handle the fault code and get your heat moving again.

Call us at or schedule an appointment online today.

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