Description
Product Overview
The LKJ 52W2901 furnace flame sensor is a critical component for maintaining efficient and safe furnace operation. This replacement part is engineered to detect the presence of a flame during ignition and continuously monitor it while the furnace is running. With a total length of approximately 5.3 inches, it fits seamlessly into most Lennox, Armstrong, and Ducane furnace models, including series G40, G41, G50, G51, G60, G61, and G71. The sensor is constructed from durable materials to withstand high temperatures and ensure long-lasting performance. Key specifications include package dimensions of 5.79 x 3.94 x 0.55 inches and a weight of 0.35 ounces, making it compact yet robust for reliable use in residential heating systems.

Usage
This flame sensor is ideal for homeowners and HVAC technicians seeking a reliable replacement part for malfunctioning or worn-out sensors in residential furnaces. It is commonly used in forced-air heating systems during routine maintenance or repair scenarios, particularly when the furnace fails to ignite or stay lit. The sensor is compatible with a wide range of furnace models from leading brands, ensuring it can be deployed in various home environments. Always refer to your furnace’s manual to confirm compatibility before installation to avoid issues and ensure optimal performance.
Why Choose Us
Our LKJ 52W2901 flame sensor stands out due to its precise engineering and exact fit for major furnace brands, reducing installation time and errors. We prioritize quality assurance, with each sensor tested to meet industry standards for durability and accuracy in flame detection. Unlike generic alternatives, this part is designed to match original equipment specifications, ensuring seamless integration and reliable operation. Customers benefit from our commitment to providing affordable, high-performance replacement parts backed by positive reviews and a track record of satisfaction in home improvement applications.
Key Features
- Exact fit for Lennox, Armstrong, and Ducane furnaces, ensuring easy installation and compatibility.
- Reliable flame detection and monitoring to prevent furnace ignition failures and enhance safety.
- Durable construction withstands high temperatures for long-lasting performance in heating systems.
- Compatible with multiple model series including G40, G41, G50, G51, G60, G61, and G71.
- Compact design with a 5.3-inch length for straightforward replacement in tight spaces.
FAQ
What furnace models is the 52W2901 flame sensor compatible with?
It is compatible with most Lennox, Armstrong, and Ducane furnaces, including series G40, G41, G50, G51, G60, G61, and G71. Always check your furnace manual for specific model compatibility before purchasing.
How do I install the 52W2901 flame sensor?
Installation is straightforward: turn off the furnace power, locate the old sensor, remove it, and insert the new one in the same position. Ensure it is securely connected and test the furnace after installation. Consult a professional if unsure.
What is the purpose of a furnace flame sensor?
The flame sensor detects whether a flame is present during ignition and monitors it while the furnace runs. If no flame is detected, it signals the furnace to shut off for safety, preventing gas leaks or hazards.
Can I use this sensor if my furnace model isn’t listed?
It is designed for specific models, so verify compatibility using your furnace’s manual or consult an HVAC expert. Using an incompatible sensor may lead to improper operation or damage.
How long does the 52W2901 flame sensor typically last?
With proper maintenance, it can last several years, depending on usage and environmental factors. Regular cleaning and inspection help extend its lifespan and ensure reliable performance.








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