Clearing Error Code 223 on Your Lennox® Furnace

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

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

Depend on the Experts at Parker Pearce Service Experts to handle repairing this furnace error. Our NATE-certified technicians are among the elite in the industry when it comes to diagnosing and repairing furnace troubles.

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

How a Low Pressure Switch Works

Pressure switches are an essential part of the heating system.

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 sucks in new gas and air so the burners can start.
  • When the pressure switch senses that sufficient air is being dragged 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 different speeds—and be more efficient.

What Happens When a Low Pressure Switch Malfunctions

The low pressure switch may be open for several reasons.

There could be a:

  • Obstructed vent
  • Plugged condensate drain
  • Cracked hose

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

Your furnace will tell you there’s an issue 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 repeats a fault code.

Estimated Repair Cost for Furnace Error Code 223

The expense to fix your furnace depends on the root problem and the hours it takes to remedy 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 Parker Pearce Service Experts

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

Call us at 301-476-4577 or schedule an appointment online today.