How To Fix Ignition Lockout On Furnace? Quick Tips

Rima Chatterjee

Understanding Ignition Lockouts on Furnaces

Homeowners know how frustrating furnace ignition lockouts can be. The problem occurs when the flame won’t ignite – shutting down the system, and making warm air cold. Common causes are lack of fuel or faulty igniters. Fortunately, modern furnaces have safety features, like gas leaks and fire prevention.

Start by checking the pilot light and air filters. Then, inspect the limit switch settings, and ensure good airflow in the blower compartment. Look for leaks or blockages in the ventilation system. Malfunctioning ignition control systems can cause soft or hard lockouts. These can indicate a problem with the flame sensors or pressure switches.

One homeowner had repeated lockouts with their Carrier furnace. An error code showed a defective flame signal during the ignition sequence. After checking their HVAC system, they found debris blocking airflow from the combustion process due to a damaged heat exchanger. With help from the BAP Heating service, they were able to fix the issue.

If frequent ignition lockouts occur with your furnace, contact an HVAC specialist. Don’t try to repair it yourself, as it can cause more damage and be expensive. It’s often faulty parts that cause the issue. So, it’s best to rely on professionals when dealing with furnace lockouts.

Causes of Ignition Lockouts

Ignition lockouts on furnaces happen when the furnace fails to ignite and launch its heating cycle. Reasons for this can range from faulty igniters, flame rods with issues, and blocked air filters. In modern furnaces, the computer system spots unsafe conditions or code sequences during ignition and triggers a lockout.

Common causes are faulty igniters and sensors with debris blocking readings of the flame. Blocked ventilation systems and low gas pressure can also be culprits. High-efficiency furnaces have safety features to shut off in case of fire danger.

If you experience an ignition lockout, try resetting it by switching off the power and waiting a few minutes before turning it back on. If that doesn’t work, an HVAC technician can help. They’ll read error codes and use special tools to diagnose and fix the issue.

Regular maintenance and air filter changes can keep your furnace in top shape and avoid ignition lockouts.

Troubleshooting Ignition Lockouts

Ignition lockouts can be a difficult and dangerous problem for homeowners. This article will guide you through the troubleshooting process so you can figure out and fix the issue.

  1. Step 1: Check Your Furnace.
    Check if your furnace is working properly – check if there are proper ventilation and air filters. Dirty filters or clogged vents can cause air pressure issues which can result in ignition lockouts. Make sure the pilot light is lit. And make sure there’s no debris blocking the flame sensor. If you don’t feel confident, it’s better to call a certified HVAC technician.
  2. Step 2: Inspect Flames and Sensors.
    If everything with the furnace looks okay, inspect the flames and sensors closely. The flame sensor is an important part of the gas furnace ignition system. If it’s damaged or covered with dirt, rust, or carbon deposits, it can cause an ignition lockout code and unsafe conditions. Clean it gently with steel wool, or replace it if it’s damaged.
  3. Step 3: Recycle Control Board.
    A faulty igniter or limit switch can also cause lockouts. To recycle the control board and reset it, turn off both main switches for at least 30 seconds before turning them back on. Wait until all sequences are complete. Then, check for status codes that may be displayed differently on different furnaces.

These steps should fix your ignition lockout problem. But if the issue persists, or you find any damage during the inspection, it’s best to contact BAP Heating service specialists.

To prevent breakdowns, have your HVAC system regularly inspected and maintained by an HVAC specialist. A well-maintained system runs better and lasts longer, saving you money in the long run.

If your furnace is as cold as my love life, this guide on fixing ignition lockouts is just for you!

Fixing Ignition Lockouts

Are you having problems with the ignition lockout on your furnace? This happens when your furnace won’t start its heating cycle. To ensure safety, turn off the furnace and gas valve first.

Here’s a 6-Step Guide on fixing it:

  1. Check air filters – Replace them if they are dirty.
  2. Inspect flame sensors – Clean with steel wool or sandpaper if needed.
  3. Reset limit switches – Check if they work properly.
  4. Examine hot surface igniters – Clean or replace if damaged.
  5. Check gas pressure – Low or high pressure can cause ignition issues.
  6. Call an HVAC specialist – BAP Heating Service can help.

Many lockouts happen due to air pressure problems. Check switches and draft inducers. Clean pilot flames, vents, and burner assemblies regularly. Follow manufacturer instructions.

Don’t try to repair complex issues. Get help from BAP Heating Service.

Preventing Ignition Lockouts

Be sure your furnace runs great, even in extreme winter. Stop ignition lockouts! Here’s a 5-step guide:

  1. Schedule a service appointment with an HVAC specialist. This will stop issues before they start.
  2. Clean or replace air filters every few months. Dirty filters reduce airflow and can cause lockouts.
  3. Inspect the furnace for any debris. Look near the burner assembly, combustion area, and blower compartment.
  4. Check the draft inducer, air pressure switch, heat exchanger, and gas valve. Make sure they’re not damaged or worn.
  5. Turn on your furnace system periodically to test the ignition sequence and flame signal.

Common causes of lockouts are bad igniters, dirty flame sensors/rods, defective limit switches, pilot light issues, or faulty flames causing soft lockout errors. Take action now to avoid costly repairs and keep your home safe from fire risks. Contact BAP Heating Service today, Give your furnace the care it needs.


Having a dependable furnace is a must to keep warm and safe in the cold months. A lockout may be a nuisance, but it could signify a major issue with your HVAC system, like a defective igniter, damaged flame sensor, or air pressure troubles. If you’re not sure what to do or experience continued problems, get an HVAC specialist like BAP Heating Service. Often, furnace lockouts can be fixed by tackling typical causes such as dirty air filters or bits in the burner group. To avoid hazardous conditions connected to combustion and ventilation systems, stick to the manufacturer’s instructions and have your furnace inspected regularly by experts. Regular maintenance can also stop damage to your heat exchanger and other parts. Inspect the pilot flame often and take note of any temperature or pressure changes in the blower compartment. By staying aware of these factors, homeowners can keep secure and guarantee their furnaces run easily all winter long.

About the author

Debarghya Roy: A heating systems author, Passionate about energy efficiency and sustainability, Sharing insights and empowering readers through informative blog articles.