Fixing Error Code 229 on Your Lennox® Furnace

Getting error code 229 on your Lennox® furnace?

This signifies your furnace is ignited at high speed because its low pressure switch wouldn’t close.

It’s important to have a pro like one from Freschi Service Experts in Concord work on repairing or replacing this part. Our technicians are NATE certified, which means they’re well-prepared to fix a furnace error like yours.

We want you to be completely happy with our furnace repair in Concord. That’s why we back all of our work with a one-year 100% Satisfaction Guarantee.*

How a Low-Fire Pressure Switch Works

Two-stage furnaces have various pressure switches to let the system to run at different speeds—and use less energy. These switches also make sure your furnace runs safely and vents extra gases from the heat exchanger.

What Happens When a Low-Fire Pressure Switch Malfunctions

Your low pressure switch may not be operating correctly if your furnace inducer motor switches on in high speed and high ignition, then slows down and enters into low-fire mode about 30 seconds later.

Your furnace will indicates something’s amiss 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 may see fast flashes or an alternating slow flash as it announces a fault code.

Estimated Repair Cost for Furnace Error Code 229

A blocked vent or a draft can also trigger the error, so your Freschi Service Experts Expert will investigate other parts of your furnace first.

The bill to fix your furnace depends on what’s wrong with it and how long it takes to fix it.

You can expect to pay between $40 and $350 if you require a new low-fire pressure switch.

Turn to the Experts at Freschi Service Experts

When you need to have your furnace fixed, reach out to the Experts at Freschi Service Experts to work out the fault code and take care of the situation.

Call us at 925-384-1303 or schedule an appointment online today.


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At Service Experts, our top priority is always the health and safety of our customers and team. We are following all COVID-19 (Coronavirus) public safety guidelines and adjusting our business practices as needed to ensure customer and employee wellbeing. As a precautionary measure, anyone working on behalf of Service Experts – including our technicians – is being asked to stay home for the recommended 14 day quarantine period if they are returning from out-of-country, have been exposed to a presumptive or confirmed case, or are feeling unwell. We are providing our technicians and other field employees with additional health and safety guidance to assist in keeping our customers and employees safe. Please be prepared to answer brief health and safety questions with our representative. We will continue to monitor the situation and will adjust our business practices as required. We recognize that this may be a particularly stressful time and want you to know that, we are committed to serving you and making your experience as easy as possible.