It’s frustrating when your house is cold and your Lennox® furnace is flashing an error code. That’s why we’ve put together this helpful guide on the five most common codes, which include:

  • 312—reduced airflow affecting indoor blower speed.
  • 201—furnace can’t communicate with indoor blower motor.
  • 292—indoor blower motor won’t start.
  • 207—hot surface igniter is open.

You might be able to resolve some of these errors on your own. But many may require professional assistance. When it comes to furnace repair in Minneapolis and surrounding areas, homeowners have trusted Ditter Cooling, Heating & Electrical for 75 years. That’s because we’re not comfortable until you are.

Learn more about what causes these errors, how to fix them and how to prevent them in the future.

Lennox Furnace Error Code 312

What It Means

Lennox furnace error code 312 means reduced airflow is affecting the indoor blower, which distributes warm air. The blower will run at a reduced speed to avoid damaging the motor. As a result, your furnace may be distributing less heat.

What Causes It

This error is often caused by reduced airflow. A dirty filter is one of the most common culprits.

How to Fix It

  • Check the air filter and replace it if it’s dirty.
  • If the air filter isn’t the problem, an HVAC professional will need to inspect your duct system. Your pro may need to repair or add more ductwork.

How to Avoid It in the Future

  • Change your air filter regularly.
  • Flat filters should be replaced once a month.
  • Pleated filters can last up to three months.

Lennox Furnace Error Code 201

What It Means

Lennox furnace error code 201 means your furnace can’t communicate with the indoor blower motor. The indoor blower distributes warm air, so you won’t have heat.

What Causes It

Several things can be wrong, including:

  • A power outage
  • A brown-out
  • Motor not receiving power
  • Loose wiring
  • Condensation on uncovered system component controls
  • Flipped breaker

How to Fix It

Although your furnace runs on gas, it also needs electricity to work. So, if your power is out, it won’t be able to run. If you do have power:

  • Make sure the furnace switch is set to “on.” This looks like a light switch and is located on or near your furnace. If it was in the “off” position, it may take your furnace several minutes to restart.
  • Check the air filter and breaker box. A dirty air filter can overheat your furnace and trip the breaker.
    • If your breaker is tripped, check your air filter by holding it to the light.
    • If it’s dirty, replace it. Then try resetting the breaker.
    • If it trips again, leave it alone and call us at 763-200-5055 for help.

How to Avoid It in the Future

  • Change your air filter regularly.
  • Schedule annual furnace maintenance, which can help you avoid problems like loose wiring. We offer a convenient HVAC maintenance program that helps you stay on top of your heating and cooling tune-ups.

Lennox Furnace Error Code 292

What It Means

Lennox furnace error code 292 means your indoor blower motor won’t start. Your furnace will go into Watchguard mode as a precaution. While it’s in this mode, it will wait an hour before trying to restart again. When this error occurs, you won’t have any heat.

How to Fix It

You’ll need professional help with this problem, which could be caused by:

  • A seized bearing
  • Stuck wheel
  • Another obstruction

Your HVAC technician may need to replace the indoor blower motor, motor module or wheel.

How to Avoid It in the Future

Annual furnace maintenance may help you reduce the chance of emergency repairs.

Lennox Furnace Error Code 207

What It Means

Lennox furnace error code 207 means the hot source igniter is open. This device lights the gas in your furnace, which creates heat. During this error, your furnace won’t turn on for safety reasons.

How to Fix It

You’ll need professional assistance to solve this error code, as it involves:

  • Measuring the resistance of the hot surface igniter.
  • Replacing the igniter if it doesn’t meet the specified range.

How to Avoid It in the Future

  • Annual furnace maintenance may help you reduce the chance of emergency repairs.

Lennox Furnace Error Code 125

What It Means

Lennox furnace error code 125 means your furnace has a control hardware error. Your furnace won’t be able to turn on because there’s a problem with the control board.

How to Fix It

You’ll need a HVAC technician to fix this issue, as the control board may need to be replaced.

How to Avoid It in the Future

Annual furnace maintenance may help you reduce the chance of emergency repairs.

We Can Solve Your Furnace Error Codes

We know your furnace often picks the worst time to break down. At Ditter, we’re not comfortable until you are, so our HVAC technicians are available 24/7 for emergency furnace repair. As NATE-certified pros, they have extensive training and experience resolving complicated heating problems. Give us a call at 763-200-5055 to schedule your appointment now.