Getting cold 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 issue, your system will not run for your safety.
Turn to the Experts at San Antonio Air Service Experts to handle fixing this furnace error. Our NATE-certified technicians are among the elite in the industry when it comes to recognizing and repairing furnace issues.
Your satisfaction is important to our team. That’s why we back our furnace repair work in San Antonio with a 100% Satisfaction Guarantee* for a year.
How a Low Pressure Switch Works
Pressure switches are a necessary part of the heating system.
Here’s how your furnace works after the thermostat starts 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 tells the control board to ignite the furnace.
- Your furnace ignites and heats your space.
A two-stage furnace has several pressure switches, which help it to run at different speeds—and use energy more efficiently.
What Happens When a Low Pressure Switch Fails
The low pressure switch may be open for several reasons.
There could be a:
- Obstructed vent
- Plugged 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 an issue 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 reiterates a fault code.
Estimated Repair Cost for Furnace Error Code 223
The cost 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 San Antonio Air Service Experts
When you need furnace service, you can call on the professionals at San Antonio Air Service Experts to take care of the fault code and get your heat moving again.
Call us at 210-570-9705 or schedule an appointment online today.