Clearing Error Code 223 on Your Lennox® Furnace

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

This is telling you your furnace’s low pressure switch is open. Due to the failure, your system will not work for your safety.

Depend on the Experts at Service Experts Heating, Air Conditioning & Plumbing to deal with mending this furnace error. Our ACE-certified technicians are among the elite in the industry when it comes to diagnosing and repairing furnace issues.

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 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 start.
  • 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 home.

A two-stage furnace has more than one pressure switches, which permit it to run at different speeds—and use less energy.

What Happens When a Low Pressure Switch Acts Up

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

There could be a:

  • Closed off vent
  • Stopped condensate drain
  • Cracked hose

There could also be a problem 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 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 replays a fault code.

Estimated Repair Cost for Furnace Error Code 223

The expense to fix your furnace depends on the issue it has48} 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 Service Experts Heating, Air Conditioning & Plumbing

When you require furnace service, you can trust the professionals at Service Experts Heating, Air Conditioning & Plumbing

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

Call us at or schedule an appointment online today.

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