Fixing Error Code 223 on Your Lennox® Furnace

Getting chilly because you’re getting 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 safety reasons.

Turn to the Experts at Service Experts Heating, Air Conditioning & Plumbing to handle fixing this furnace error. Our ACE-certified technicians are among the best in the industry when it comes to diagnosing and repairing furnace problems.

Your satisfaction is important 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 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 fire.
• When the pressure switch senses that enough air is being pulled 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 several pressure switches, which allow it to run at different speeds—and use less energy.

What Happens When a Low Pressure Switch Malfunctions

The low pressure switch may be open for several reasons.

There could be a:

• Blocked 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 let you know there’s an issue 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 notice 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 repair 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 need 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 flowing again.

Call us at or schedule an appointment online today.