Clearing Error Code 223 on Your Lennox® Furnace

Getting chilly because you’re seeing 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.

Trust the Experts at Strand Brothers Service Experts to deal with repairing this furnace error. Our NATE-certified technicians are among the best in the industry when it comes to recognizing and repairing furnace troubles.

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

How a Low Pressure Switch Works

Pressure switches are an essential part of the heating operation.

Here’s how your furnace acts after the thermostat begins 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 signals 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 different speeds—and be more efficient.

What Happens When a Low Pressure Switch Acts Up

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

There could be a:

  • Obstructed 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 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 observe fast flashes or an alternating slow flash as it reiterates a fault code.

Estimated Repair Cost for Furnace Error Code 223

The expense to fix your furnace depends on the root problem and the time 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 Strand Brothers Service Experts

When you have to have furnace service, you can lean on the professionals at Strand Brothers Service Experts to take care of the fault code and get your heat flowing again.

Call us at 512-592-3072 or schedule an appointment online today.