Clearing Error Code 223 on Your Lennox® Furnace

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

This means your furnace’s low pressure switch is open. Due to the issue, your system will not function for your protection.

Trust the Experts at Stallion Heating and Air Conditioning to take care of repairing this furnace error. Our ACE-certified technicians are among the elite in the industry when it comes to recognizing and repairing furnace problems.

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 important part of the heating process.

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 exhausts combustion gases from the heat exchanger and pulls in new gas and air so the burners can ignite.
  • When the pressure switch senses that sufficient 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 several pressure switches, which help it to run at various speeds—and use energy more efficiently.

What Happens When a Low Pressure Switch Acts Up

The low pressure switch may be open for several 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 tell you there’s a problem 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 reiterates 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 fix 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 Stallion Heating and Air Conditioning

When you have to have furnace service, you can lean on the professionals at Stallion Heating and Air Conditioning

to work on the fault code and get your heat moving again.

Call us at or schedule an appointment online today.

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