Fixing Error Code 229 on Your Lennox® Furnace

Getting error code 229 on your Lennox® furnace?

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

It’s best to let a pro like one from Service Experts Heating & Air Conditioning in Denver work on repairing or replacing this part. Our technicians are NATE certified, which means they’re ready to fix a furnace error like this one.

We want you to be absolutely content with our furnace repair in Denver. 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 multiple pressure switches to allow the system to run at different speeds—and be more efficient. 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 Fails

Your low pressure switch may not be functioning correctly if your furnace inducer motor starts up in high speed and high ignition, then loses speed and shifts into low-fire mode about 30 seconds afterward.

Your furnace will demonstrate something’s wrong with a red flash from its indicator light, which it uses to exhibit error codes. It has this red light to flash code, like Morse code.

You may observe 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 generate the error, so your Service Experts Heating & Air Conditioning Expert will investigate other parts of your furnace first.

The price to fix your furnace relies on what’s wrong with it and how long it takes to repair it.

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

Turn to the Experts at Service Experts Heating & Air Conditioning

When you need to have your furnace repaired, contact the Experts at Service Experts Heating & Air Conditioning to work out the fault code and take care of the situation.

Call us at 303-647-5853 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.