How to Fix Atwood Furnace Ignition Lockout Fault

Atwood furnaces are popular choices for RVs and mobile homes due to their efficiency and reliability. However, like any mechanical device, they can experience issues over time. One common problem faced by owners is the “ignition lockout” fault, where the furnace fails to ignite or shuts down shortly after ignition. In this article, we will delve into the possible causes behind this fault and provide practical solutions to fix it, ensuring your Atwood furnace operates smoothly and keeps you comfortable during your travels.

1. Understanding the Ignition Lockout Fault

Before we dive into the troubleshooting steps, it is essential to comprehend what an ignition lockout fault means. When the Atwood furnace detects an issue during the ignition process, it goes into a safety mode known as “lockout.” This lockout prevents the furnace from attempting to ignite repeatedly, avoiding potential hazards and damage. Common reasons for this fault include blocked airflow, insufficient LP gas supply, or electronic component malfunctions.

2. Checking the LP Gas Supply

The first step in addressing an ignition lockout fault is to ensure a steady supply of LP gas to the furnace. Follow these steps to check the gas supply:

  • Step 1 – Verify LP Gas Cylinder: Ensure that your LP gas cylinder is not empty. Check the gauge on the cylinder or consult the RV’s gas system monitoring panel if available.
  • Step 2 – Gas Valve Inspection: Check the furnace’s gas valve and make sure it is open. Sometimes, the valve might be inadvertently turned off during maintenance or storage.
  • Step 3 – Check Gas Regulator: Inspect the gas regulator for any blockages or debris. If clogged, carefully clean it or replace it if necessary.
  • Step 4 – Test with Other Gas Appliances: Test other gas appliances in your RV to see if they are functioning correctly. If they are not working either, the issue might be with the main gas supply or regulator.

3. Inspecting the Airflow

Proper airflow is critical for the ignition process to occur smoothly. Lack of airflow can lead to an ignition lockout fault. Let’s explore how to address potential airflow issues:

  • Step 1 – Check Air Intake and Exhaust Vents: Ensure that the air intake and exhaust vents of the furnace are free from obstructions such as debris, insects, or ice buildup.
  • Step 2 – Inspect Furnace Air Filter: If your Atwood furnace is equipped with an air filter, check and clean it regularly. A clogged filter can disrupt airflow and cause the furnace to shut down.
  • Step 3 – Verify Ductwork and Venting: Examine the ductwork and venting system for any blockages or kinks that might restrict airflow. Correct any issues you find to improve ventilation.

4. Resetting the Ignition Lockout

After addressing the potential gas supply and airflow issues, you can attempt to reset the ignition lockout. This process varies depending on the model of your Atwood furnace. Refer to the furnace’s user manual for specific instructions on how to reset the lockout. In most cases, you may need to power down the furnace, wait for a few minutes, and then restart it. However, remember that resetting the lockout is a temporary solution and won’t fix underlying problems.

5. Cleaning and Maintaining Electronic Components

Faulty electronic components can also trigger the ignition lockout fault. Regular maintenance and cleaning can help prevent these issues:

  • Step 1 – Clean Flame Sensor: The flame sensor detects the presence of a flame during ignition. Over time, it can accumulate dirt or carbon deposits, affecting its accuracy. Gently clean the flame sensor with a soft cloth or fine-grade sandpaper.
  • Step 2 – Inspect Igniter and Burner Assembly: Check the igniter for signs of damage or wear. If necessary, replace it with a compatible replacement. Additionally, inspect the burner assembly for any obstructions or rust that might hinder the ignition process.
  • Step 3 – Look for Loose Wiring Connections: Loose or corroded wiring connections can disrupt the proper functioning of the furnace. Carefully inspect all electrical connections and tighten or clean them as needed.


Dealing with an ignition lockout fault in your Atwood furnace can be frustrating, but by following these practical troubleshooting steps, you can identify and resolve the issue. Remember to prioritize safety during the process, and if you encounter complex problems beyond your expertise, don’t hesitate to seek professional assistance. With proper maintenance and regular checks, you can ensure your Atwood furnace provides reliable warmth and comfort during your journeys.

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