Fixing Error Code 223 on Your Lennox® Furnace

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

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

Trust 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 recognizing and repairing furnace problems.

Your satisfaction is critical to us. 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 process.

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 start.
  • When the pressure switch senses that a suitable amount of air is being brought into the burners, it closes and tells the control board to ignite the furnace.
  • Your furnace ignites and heats your home.

A two-stage furnace has a few pressure switches, which permit it to run at various speeds—and use less energy.

What Happens When a Low Pressure Switch Fails

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 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 see fast flashes or an alternating slow flash as it repeats a fault code.

Estimated Repair Cost for Furnace Error Code 223

The price to fix your furnace depends on what’s wrong with it48} and how long it takes to fix 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 Service Experts Heating, Air Conditioning & Plumbing

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

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

Call us at or schedule an appointment online today.

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