Lennox 15P86 – Lennox 101334-09 Defrost Sensor Wiring Harness is a factory-approved replacement component designed for reliable frost protection and accurate heat pump operation. This OEM harness includes two temperature sensors (#1 and #2) with 50-inch and 12-inch leads, plus a fixed 10K resistor in place of Sensor #3 to maintain correct circuit resistance and prevent nuisance defrost cycles. Engineered for Lennox residential and light commercial systems, it ensures proper coil temperature monitoring, efficient defrost timing, and improved system reliability in cold-weather conditions.

Ideal for restoring performance during sensor failure, wire damage, freeze-ups, or diagnostic fault codes, this harness installs quickly using existing factory connectors with no splicing required. Suitable for HVAC service technicians, facility maintenance teams, and homeowners seeking dependable, system-matched repair parts.

Key Features:
• Genuine Lennox OEM defrost sensor harness
• Includes two sensors: 50" and 12" leads
• Fixed 10K resistor replaces third sensor
• Helps prevent coil icing and efficiency loss
• Plug-and-play fit for compatible Lennox heat pumps
• Supports accurate temperature and defrost control