Product Overview:
The Fyizo FYZ-01-SO56 is an OEM-upgraded flame sensor engineered to replace the Lennox 20J91. It delivers precise flame detection and consistent ignition control, ensuring your furnace runs safely and efficiently. Designed for long-term reliability, this sensor is an excellent choice for homeowners and HVAC professionals seeking a high-quality replacement with OEM-level performance.

Key Features and Benefits:
This upgraded flame sensor is built to match the dimensions and electrical performance of the original Lennox 20J91. It offers accurate flame sensing to prevent ignition issues and maintain efficient operation. The stainless steel probe and ceramic insulator withstand extreme heat and corrosion. Installation is simple—plug in and secure without special tools or wiring changes. Every sensor is factory tested for dependable performance and longevity.

Specifications:
Brand: Fyizo
Part Number: FYZ-01-SO56
Replaces: Lennox 20J91
Type: Flame Sensor Assembly
Material: Stainless steel rod with ceramic base
Application: Gas furnaces and HVAC ignition control systems

Weight and Dimensions:
Weight: 0.08 lb
Length: 3.75 in
Width: 0.5 in
Height: 0.5 in

Additional Information:
The Fyizo FYZ-01-SO56 provides the same fit and function as the Lennox 20J91 but features an improved design for longer service life and stable ignition performance. It ensures proper flame detection, helping your furnace maintain safe operation and reliable heat output. Compatible with various Lennox, Armstrong, and Ducane models, this flame sensor delivers proven performance season after season.

Choosing Fyizo OEM-upgraded parts helps extend furnace life, reduce maintenance downtime, and preserve energy efficiency. The FYZ-01-SO56 offers the perfect balance of affordability, durability, and OEM-grade reliability for demanding HVAC systems.