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Decoding Lennox Furnace Error Codes Common Issues and Fixes

Decoding Lennox Furnace Error Codes: Common Issues and Fixes


Decoding Lennox Furnace Error Codes: Common Issues and Fixes

The first step in figuring out how to fix an issue with a Lennox furnace is to decode Lennox furnace error codes to get a better understanding of what is happening with the unit. Identifying the type of code and understanding potential causes can help ensure the right steps are taken to repair or install a new furnace system. These codes are specific to Lennox furnaces, and understanding them is a crucial part of maintaining home comfort.

Identifying Common Error Codes

Lennox furnaces have several common error codes assigned to them, which are displayed based on the problem the furnace is experiencing. Some of the most common Lennox error codes include E1, BL, L2, OOL and LF. Each code is specific to a different issue, from pressure switch problems to an issue with the furnace's fans.

E1: An E1 Lennox furnace error code is indicative that a problem is occurring with the pressure switch. The pressure switch is linked to the inducer fan and when the fan cannot form a seal, the pressure switch trips which causes the E1 code to appear.

BL: A BL code stands for "burner lockout" error code and it typically means that a limit has been hit. This limit could be caused by a lack of airflow, blocked venting or an issue with the flame sensor.

L2: An L2 code means the furnace does not have a furnace flame on the first or second stage. This is usually due to the furnace's rollout switch being tripped, resulting in the L2 code being displayed.

OOL: The OOL error code is associated with the rollout switch being tripped too often. If there is an issue with the furnace's flame, it may cause the switch to trip more often, resulting in the OOL code.

LF: An LF code is associated with a problem with the furnace's fans. Both the inducer fan and blower fan must be operating properly in order to make sure the furnace is functioning properly. If either fan is not working, the code LF will appear.

Common Issues and Fixes

Common issues with Lennox furnaces, and their associated error codes, can have some very basic fixes that can be done at home by homeowners. However, many issues require the expertise of a skilled HVAC technician.

E1: To fix an E1 error code, the first step is to check the inducer fan to make sure it is running. If it is not, the owner should reset any circuit breakers that have been tripped and make sure the furnace's power switch is turned on. If the issue persists, the issue is more than likely not caused by the inducer fan.

BL: An easy to fix technical issue with a Lennox furnace experiencing a BL error code is that it needs to be reset. This can be done by switching the furnace off, waiting 30-60 seconds, and then turning the power switch back on. If this does not work, a professional HVAC technician must be called to identify the cause of the problem.

L2: The first step in fixing an L2 code can be checking the furnace's flame sensor to make sure it is clean. If it is dirty and not reading properly, it must be cleaned with fine sandpaper or replaced completely. If the issue persists after cleaning, a professional HVAC technician must be called.

OOL: For an OOL error code, the most common cause is faulty wiring in the furnace's circuits. This requires professional attention and should not be done by a homeowner.

LF: An LF code can be caused by a faulty thermostat. The easiest solution for this is to switch the thermostat out with a new one and check if the issue is resolved. If the issue persists, the furnace's motors, wiring and other components should be checked by an HVAC technician.


When it comes to repairing or installing a Lennox furnace, it is important to be aware of common error codes and their associated issues. With the help of a professional and reliable HVAC technician, any furnace issue can be identified and fixed in a timely and effective manner.

If you wish to read more information about Lennox Furnace Error Codes, click here. For further assistance, call Local Reliable Appliance Repair at tel:(866) 516-1222 for the best solutions to any Lennox furnace error code related issues.

Decoding Lennox Furnace Error Codes: Common Issues and Fixes
Decoding Lennox Furnace Error Codes: Common Issues and Fixes
Decoding Lennox Furnace Error Codes: Common Issues and Fixes

Preventive Action to Avoid Lennox Furnace Error Codes

  1. Properly Inspect and Maintain the Furnace – It is important to inspect the furnace and filter regularly to keep it running smoothly. Inspect the furnace at least once a year, more frequently if you have pets or live in an area with high levels of dust. Make sure to inspect the filter and clean or change it as needed.

  2. Be Aware of Common Issues – Be aware of common Lennox furnace problems, such as clogged filters, blocked air ducts, and faulty thermistor wires. If any of these issues arise, contact a professional technician to diagnose and repair the problem as soon as possible. Pay close attention to unfamiliar noises and odors as Lennox furnaces can sometimes malfunction due to component failure as well as excessive heat and wear.

  3. Clear Away Debris Close to the Furnace– It is important to keep any potential debris away from the furnace, such as leaves, twigs, rocks, and any other items that may block or obstruct the airflow. This can cause an alarm to be triggered due to the lack of air flow, resulting in a Lennox furnace error code being displayed.

  4. Be Mindful of Temperature Settings– Lennox furnaces require specific temperature settings to operate safely and efficiently. Make sure that the thermostat is set within the recommended range to avoid overworking the furnace which could lead to a Lennox furnace error code.

  5. Contact a Professional Technician– If a Lennox furnace error code does display, contact a professional technician immediately as attempting to troubleshoot it on your own may result in further damage to the machine. A technician will be able to isolate and repair the issue.

Average Lennox Furnace Error Codes Repair Costs in San Diego

Repairing a Lennox furnace can be expensive, especially if it has an error code. The average repair cost in the city of San Diego, including labor and materials can range from a minimum of $250 to a complex repair/installation of $850. Hiring a reliable appliance repair service such as Local Reliable Appliance Repair (tel:(866) 516-1222) can help ensure your furnace is repaired correctly.

Common parts that need to be replaced include control boards, igniters, blower motors, and belts. Control boards can cost about $150, igniters about $150, blower motors about $200, and belts around $100. In some cases more complex repairs may need to be done that can include replacing the heat exchanger or burner assembly. Heat exchangers can range anywhere from $500 to $900, while burner assemblies can cost upwards of $1000 or more. Labor costs in San Diego range from $75 to $125 an hour.

Before any repair is done, it is best to check with your manufacturer's warranty to see if any of the costs will be covered. In some cases, the part or service may be free of cost depending on the make and model of your Lennox Furnace.

For the best advice on Lennox furnace error codes repair costs in San Diego, please call Local Reliable Appliance Repair at tel:(866) 516-1222.

Understanding Lennox Furnace Error Codes

Lennox furnaces are commonly used in residential and commercial spaces but like any appliance, they can experience technical difficulties. It's often best to call a HVAC technician for assistance whenever a furnace is malfunctioning. Without the proper knowledge and experience of repairs, a malfunction in a furnace can become dangerous. It's important to contact a reliable and experienced technician who can identify and fix the problem correctly.

Fortunately, local businesses like Reliable Appliance Repair in San Diego can help. Reliable Appliance Repair (tel:(866) 516-1222) is a family-owned business that specializes in HVAC and appliance repairs and installations. Their highly trained technicians have at least five years of experience, and they are licensed, certified, and insured. Best of all, Reliable Appliance Repair offers same-day service for both appliance and HVAC repair and installation. What's more, as a first-time customer, you can receive $25 off labor.

Reliable Appliance Repair can quickly and accurately diagnose error codes for Lennox furnaces. Common Lennox furnace error codes include:
* 13 open high limit or roller switch
* 14 Short high limit or roller switch
* 15 Open pressure switch
* 16 Short pressure switch
* 25 Open roll-out switch
* 26 Short roll-out switch
* 34 Open flame sensing electrode
* 35 Short flame sensing electrode
* 45 Pressure switch stuck closed

With the right experience and training, Reliable Appliance Repair can accurately diagnose the problem and provide the necessary solution. Their technicians can also provide helpful tips to extend the life of your furnace and keep it running safely and efficiently.

Overall, dealing with a Lennox furnace error code can be tricky and dangerous, but with a reliable and experienced HVAC company like Reliable Appliance Repair, you can be sure your repair is in safe hands. With same day services, licenses and certifications, and discounts for first-time customers, Reliable Appliance Repair can quickly diagnose and repair any problem you may have with your Lennox furnace.
To contact Reliable Appliance Repair and take advantage of the same-day services, licensed and certified HVAC technicians, and discounts for first time customers, call (866) 516-1222.

FAQ – Decoding Lennox Furnace Error Codes: Common Issues and Fixes and Lennox Furnace Error Codes

What is a Lennox Furnace?
A Lennox Furnace is a forced-air heating system made by Lennox, a global leader in comfortable, energy efficient home heating. Lennox furnaces use electricity, natural gas and propane to generate heat to warm your home during the winter months.

What are Lennox Furnace Error Codes?
Lennox Furnace Error codes are codes that are displayed on the control panel of the furnace when it has an issue or malfunctions. These codes help diagnose the issue and also helps the technician identify and address the issue.

What is a Common Issue With Lennox Furnaces?
The most common issue with Lennox furnaces is blocked air filters. This can cause a wide range of issues such as too low or high air flow, incorrect temperature reads and inefficient gas operations.

How can I Fix a Lennox Furnace Error Code?
The specific steps taken to fix a Lennox Furnace Error Code vary depending on the code itself. However, some of the most common fixes include cleaning or replacing the furnace filter, checking and replacing the blower motor, and checking and cleaning the sensors.

What are Some Other Common Lennox Furnace Issues?
Other common Lennox Furnace issues include faulty wiring, worn out components, clogged or faulty valves, and inefficient blower operation.

When Should I Call an Expert?
It is best to call a professional technician if you are experiencing any issues with your Lennox Furnace. They can identify the root cause of the problem and provide effective and timely solutions. For best results, call a Local Reliable Appliance Repair at (866) 516-1222.