How do I know if my Lennox 20J91 flame sensor is bad

The Reznor 50450 Wire Assembly is a high-temperature flame sensor lead designed for precise signal transmission between the sensing probe and the HVAC ignition controller

Simplified Installation: Features a panel mount design with unpluggable screw terminal blocks and standard 3/16" brass process connections

This OEM Lennox replacement part features a rugged foot-mount design and leads for straightforward integration into existing control cabinets

Tecumseh K90-28 Overload Kit 319852-301 How do I know ifThe Tecumseh K90 28 Overload Kit is a critical external compressor protection component engineered for high performance hermetic systems. Designed to monitor the common winding of the motor, this kit utilizes a bimetallic thermal disc to sense excessive current draw or localized overheating. When temperatures exceed operational thresholds, the overload relay breaks the electrical circuit, preventing catastrophic coil burnout and permanent motor