Fixing Error Code 223 on Your Lennox® Furnace

Getting chilly because you’re noticing error code 223 from your Lennox® furnace?

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

Turn to the Experts at Epperson Service Experts to deal with mending this furnace error. Our ACE-certified technicians are among the elite in the industry when it comes to understanding and repairing furnace troubles.

Your satisfaction is important to our team. 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 operation.

Here’s how your furnace starts 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 brings in new gas and air so the burners can fire.
  • When the pressure switch senses that sufficient air is being pulled 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 allow it to run at various speeds—and use energy more efficiently.

What Happens When a Low Pressure Switch Malfunctions

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 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 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 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 repair 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 Epperson Service Experts

When you have to have furnace service, you can lean on the professionals at Epperson Service Experts to handle the fault code and get your heat moving again.

Call us at 843-619-3781 or schedule an appointment online today.