Description
Product Overview
The BlueStars Furnace Flame Sensor is a critical safety component designed to monitor the presence of a burning flame in your furnace, ensuring reliable operation and preventing potential hazards. Constructed from high-quality, wear-resistant metal and ceramics, this sensor undergoes rigorous testing for enhanced durability and stability. Key specifications include a pack of 2 sensors, each weighing 1.58 ounces with dimensions of 1x1x1 inches, and it replaces part numbers such as 69W4301, LB-74940B, and LB74940B. With a lifetime warranty and a 4.7-star customer rating, it delivers precision detection and wide compatibility with top brands like Lennox, Armstrong, and Ducane units.

Usage
This furnace flame sensor is ideal for residential and light commercial heating systems, commonly used in homes, offices, and small businesses during colder months to maintain efficient furnace performance. It targets DIY handymen, homeowners, and HVAC technicians looking for a reliable replacement to enhance safety and prevent furnace shutdowns. Installation is straightforward—simply shut off the furnace, locate the sensor near the burner assembly, and replace the old unit while wearing work gloves for protection.
Why Choose Us
BlueStars stands out with a lifetime protection guarantee, ensuring your investment is covered against defects for the product’s entire lifespan. The sensor is engineered for superior precision and compatibility, rigorously tested to meet high standards of quality and performance. Unlike generic alternatives, it offers exact fits for major brands, reducing installation errors and providing peace of mind with its durable, long-lasting materials.
Key Features
- Lifetime protection for worry-free reliability and defect coverage
- Precision flame detection to enhance furnace safety and prevent hazards
- Wide compatibility with top brands like Lennox, Armstrong, and Ducane
- High-quality materials including wear-resistant metal and ceramics for durability
- Easy DIY installation with clear steps for quick replacement
FAQ
What brands is this flame sensor compatible with?
It is designed to fit most top name brands, including Lennox, Armstrong, and Ducane units, and replaces part numbers like 69W4301 and LB-74940B.
How do I install the furnace flame sensor?
First, shut off the furnace for safety. Then, locate the sensor near the burner, remove the old one, and install the new sensor while wearing work gloves to protect your hands.
Does the product come with a warranty?
Yes, it includes lifetime protection, covering any defects or issues that may arise during the product’s use.
Is professional help required for installation?
No, it is designed for easy DIY installation, making it suitable for handymen and homeowners with basic tools.
What materials is the sensor made from?
It is constructed from high-quality, wear-resistant metal and ceramics, tested for durability and stable performance in furnace environments.








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