Lennox Error Code List

I've compiled a list of common Lennox error codes to help diagnose furnace issues. For instance, E200 signals problems with rollout limit switches and vent pipes, while E201 indicates communication loss with the blower motor. E223 hints at low-pressure switch issues, and E241 points to flame sensor irregularities. Error 312 often results from a dirty air filter affecting blower operation. If you're facing Lennox error codes, knowing these basics can aid in troubleshooting. Understanding these codes is essential for efficient furnace maintenance and repair. Further details on how to tackle specific error codes can be found in the detailed list provided.

Key Takeaways

  • E200: Rollout limit switch issue.
  • E201: Blower motor communication lost.
  • E223: Low-pressure switch problem.
  • E241: Flame sensor out of sequence.
  • 312: Reduced airflow affecting blower.

Common Lennox Error Codes

Sometimes, Lennox HVAC systems may encounter errors indicated by specific error codes that require troubleshooting to identify and resolve the issues efficiently.

One common error is the E200 code, signaling an issue with the rollout limit switch. This error typically requires resetting the switch and inspecting the vent pipes and flame stability.

Another frequent problem is the E201 code, indicating lost communication with the blower motor. This error necessitates checking the power, wiring, and condensation to rectify the issue.

Additionally, the E223 code points to a low-pressure switch problem, advising the user to contact an HVAC technician for assistance.

If you come across the E241 error, it suggests a flame sensor out of sequence, which can be resolved by cleaning the sensor or seeking help from a technician.

Troubleshooting Lennox Error Code 312

Lennox Error Code 312 signifies a reduction in airflow that impacts the operation of the indoor blower. When this error occurs, the blower runs at a decreased speed to safeguard the motor from potential damage.

This issue leads to inadequate heat distribution within the home, affecting comfort levels. One common culprit behind Error Code 312 is a dirty air filter that restricts the airflow needed for proper operation. To troubleshoot this error, it's essential to inspect the air filter, and if dirty, replace it promptly.

Decoding Lennox Error Code 201

Experiencing Lennox Error Code 201 indicates a communication problem with the indoor blower motor. To address this issue efficiently, follow these steps:

  1. Check Power Supply: Verify that there hasn't been a power outage affecting the furnace.
  2. Inspect Wiring: Look for any loose connections or damaged wiring that may be causing the communication error.
  3. Review Breaker Status: Confirm the breaker connected to the furnace hasn't tripped, disrupting the blower motor's operation.

Fixing Lennox Error Code 292

To troubleshoot Lennox Error Code 292 efficiently, conduct a thorough inspection of the blower motor components for potential issues. Error Code 292 signals a problem with the indoor blower motor failing to initiate. This fault triggers the furnace to enter Watchguard mode, causing a delay in restarting due to the motor malfunction.

Resolving this error may necessitate a professional inspection to diagnose the root cause, which could involve a seized bearing or a stuck wheel within the blower motor. In some cases, motor replacement might be required to rectify the issue.

Regular annual maintenance of your furnace can help prevent occurrences of Error Code 292 and guarantee the smooth operation of your system.

Resolving Lennox Error Code 207

How can a hot surface igniter failure be resolved in Lennox Error Code 207? When facing this issue, it's important to act promptly for safety reasons. Here are three essential steps to tackle Lennox Error Code 207:

  1. Inspect the Hot Surface Igniter: Begin by checking the hot surface igniter for any visible damage or wear that may be causing the failure.
  2. Measure and Replace: Use appropriate tools to measure the igniter's resistance and make sure it falls within the specified range. If not, replacing the igniter is necessary.
  3. Seek Professional Help: Due to the technical nature of this repair and for safety reasons, it's advisable to enlist the expertise of a professional to resolve Lennox Error Code 207 effectively.

Understanding Lennox Error Code 125

Lennox Error Code 125 signifies a control hardware malfunction that hinders the furnace's startup process. When this error occurs, it indicates an issue with the control board, an essential component responsible for regulating the furnace's operations.

To address Error Code 125, it's recommended to contact an HVAC technician to assess and potentially replace the control board. Regular annual furnace maintenance is important in preventing such control hardware errors and minimizing the likelihood of encountering Error Code 125.

Promptly addressing this error is necessary to guarantee the efficient and safe operation of the furnace system. Professional intervention is required to accurately diagnose and resolve Lennox Error Code 125, safeguarding the furnace's functionality.

Lennox Error Code 444 Explained

Error Code 444 in Lennox furnaces signals a potential issue with the flame sensing rod detection mechanism. When this error code appears, it could indicate a faulty flame sensor or a wiring problem within the system.

If not addressed promptly, Error Code 444 can result in a furnace shutdown for safety reasons. To troubleshoot this issue, start by cleaning the flame sensor to make sure it's free of debris or buildup that could be affecting its performance. Additionally, check the wiring connections to rule out any potential issues in that area.

If cleaning the sensor and checking the wiring doesn't resolve the problem, it's advisable to contact an HVAC technician for further assistance.

Troubleshooting Lennox Error Code 555

When troubleshooting Lennox Error Code 555, the primary step is to check for a dirty air filter or restricted airflow. This error indicates a primary limit circuit open error, often caused by blockages in the air filter, vents, or ductwork. Inspect the air filter first, as a dirty filter can hinder proper airflow and trigger the error code.

Confirm that all vents are open and unobstructed, allowing for adequate air circulation. Additionally, check the ductwork for any restrictions that might impede the flow of air. Clearing these obstructions and resetting the furnace can often resolve Error Code 555.

If the issue persists, seek assistance from a professional HVAC technician to address the problem effectively.

Deciphering Lennox Error Code 666

Inspecting the thermostat settings and verifying wiring connections are essential steps in diagnosing Lennox Error Code 666 which indicates a communication error between the thermostat and the furnace. To troubleshoot this error effectively, consider the following:

  1. Check Thermostat Settings: Confirm the thermostat is properly configured and communicating with the furnace.
  2. Inspect Wiring Connections: Look for any loose or damaged wires that may be causing the communication issue.
  3. Reset Control Board: Try resetting the control board to see if that resolves the communication error.

If these steps don't resolve the problem, seeking professional assistance is recommended to accurately diagnose and address the communication error between the thermostat and the furnace.

Frequently Asked Questions

How Do You Read Lennox Error Codes?

When reading Lennox error codes, I check the LED blinking sequence by removing the front cover. This troubleshooting step helps identify common issues like flame sensor problems or blower motor failures. I follow the diagnostic codes for guidance, reset the system if needed, and contact technical support for assistance.

What Are the 2 Blinking Lights on My Lennox Furnace?

The two blinking lights on my Lennox furnace indicate normal heating operation. Understanding these patterns helps troubleshoot issues. Common problems may require maintenance like filter checks or DIY fixes, but for complex issues, seek professional help.

How Do You Read a Furnace Error Code?

To read a furnace error code, I analyze the LED blinking sequence by removing the front cover. Understanding common messages aids in troubleshooting. Identifying issues promptly is essential for resolving errors and ensuring efficient furnace operation.

What Does a Solid Red Light Mean on a Lennox Furnace?

When a solid red light appears on my Lennox furnace, it usually means a limit switch issue, blocked flue, dirty filter, or blower motor problem. Troubleshooting these common issues with the diagnostic process helps identify and implement potential solutions for the red light indicator.


In summary, understanding Lennox error codes is crucial for troubleshooting and fixing HVAC system issues efficiently.

By decoding and resolving these error codes, technicians can pinpoint the root cause of problems and implement the necessary repairs.

With a detailed list of common Lennox error codes at hand, technicians can quickly identify and address issues to guarantee optimal system performance and customer satisfaction.