Fixing Error Code 223 on Your Lennox® Furnace

Getting chilly because you’re noticing 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 run for your protection.

Depend on the Experts at Service Experts Heating & Air Conditioning to handle repairing this furnace error. Our NATE-certified technicians are among the brightest in the industry when it comes to diagnosing and repairing furnace issues.

Your satisfaction is critical to our team. That’s why we back our furnace repair work in Longmont with a 100% Satisfaction Guarantee* 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 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 sucks in new gas and air so the burners can ignite.
  • When the pressure switch senses that enough air is being dragged into the burners, it closes and tells the control board to ignite the furnace.
  • Your furnace ignites and heats your space.

A two-stage furnace has a few pressure switches, which allow it to run at multiple speeds—and be more efficient.

What Happens When a Low Pressure Switch Fails

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

There could be a:

  • Blocked 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 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 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 it and how long it takes to remedy 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

When you require furnace service, you can call on the professionals at Service Experts Heating & Air Conditioning to take care of the fault code and get your heat working again.

Call us at 303-647-5749 or schedule an appointment online today.