Clearing Error Code 229 on Your Lennox® Furnace

Seeing error code 229 on your Lennox® furnace?

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

It’s better to let a pro like one from Service Experts Heating, Air Conditioning & Plumbing in the U.S. work on repairing or replacing this part. Our technicians are ACE certified, which means they’re well-prepared to fix a furnace error like this one.

We want you to be completely satisfied with our furnace repair in the U.S.. 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 numerous pressure switches to let the system to run at different speeds—and work more efficiently. These switches also guarantee your furnace runs safely and vents excess gases from the heat exchanger.

What Happens When a Low-Fire Pressure Switch Doesn’t Work

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

Your HVAC will demonstrate something’s not right with a red flash from its indicator light, which it uses to show 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 tells you 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 & Plumbingprofessional will check other parts of your furnace first.

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

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

Rely on the Experts at Service Experts Heating, Air Conditioning & Plumbing

When you need to have your furnace mended, turn to the Experts at Service Experts Heating, Air Conditioning & Plumbing to decipher the fault code and take care of the problem.

Call us at or schedule an appointment online today.

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