Clearing Error Code 223 on Your Lennox® Furnace

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

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

Depend on the Experts at Service Experts Heating, Air Conditioning & Plumbing to take care of repairing 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 critical to our business. That’s why we back our furnace repair* for a year.

How a Low Pressure Switch Works

Pressure switches are a necessary part of the heating system.

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 gets rid of combustion gases from the heat exchanger and pulls in new gas and air so the burners can ignite.
  • When the pressure switch senses that enough 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 permit it to run at various 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:

  • Closed off 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 let you know 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 observe fast flashes or an alternating slow flash as it replays a fault code.

Estimated Repair Cost for Furnace Error Code 223

The expense to fix your furnace depends on what’s wrong with it48} and how long it takes to fix it.

Here are the usual 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 Service Experts Heating, Air Conditioning & Plumbing

When you have to have furnace service, you can lean on the professionals at Service Experts Heating, Air Conditioning & Plumbing

to take care of the fault code and get your heat working again.

Call us at or schedule an appointment online today.

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