Clearing Error Code 223 on Your Lennox® Furnace

Getting cold because you’re seeing 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 work for your protection.

Turn to the Experts at Knochelmann Service Experts to take care of fixing this furnace error. Our NATE-certified technicians are among the elite in the industry when it comes to diagnosing and repairing furnace issues.

Your satisfaction is essential to our business. That’s why we back our furnace repair work in Sharonville with a 100% Satisfaction Guarantee* 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 brings 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 signals the control board to ignite the furnace.
  • Your furnace ignites and heats your space.

A two-stage furnace has a few pressure switches, which permit 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 a couple reasons.

There could be a:

  • Closed off vent
  • Stopped condensate drain
  • Cracked hose

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

Your furnace will tell you there’s something wrong with a red flash from its indicator light, which it uses to feature 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 price to fix your furnace depends on the issue it has 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 Knochelmann Service Experts

When you need furnace service, you can lean on the professionals at Knochelmann Service Experts to take care of the fault code and get your heat working again.

Call us at 859-905-0834 or schedule an appointment online today.