The Lennox 10D09 (101334-05) defrost sensor wiring harness is an OEM replacement component designed to maintain accurate coil temperature monitoring in heat pump defrost systems. This harness includes Sensors #2 and #3 in the assembly and features a fixed 10K resistor in place of Sensor #1, allowing the defrost control board to receive the proper reference signal for reliable operation. With a 50-inch lead length, it provides the reach needed for clean routing and proper sensor placement within the outdoor unit.

Engineered for compatibility with select Lennox heat pump models, this harness restores proper defrost timing, prevents excessive frost buildup, and supports efficient winter performance. Ideal for service technicians and homeowners performing OEM-grade repairs.

 

Key Features:

• OEM Lennox 10D09 / 101334-05 replacement
• 50-inch wiring harness for flexible installation
• Includes Sensors #2 and #3
• Fixed 10K resistor installed in place of Sensor #1
• Ensures accurate temperature feedback during defrost cycles
• Helps prevent coil freeze-up and maintains peak heat pump efficiency
• Designed for reliable, long-term performance in harsh outdoor conditions

 

Specifications:

• Part Number: 10D09
• Catalog Number: 101334-05
• Harness Length: 50 inches
• Sensor Configuration: Sensors #2 & #3 included
• Sensor #1: Replaced with fixed 10K resistor
• Application: Heat pump defrost temperature sensing
• Compatibility: Select Lennox outdoor units (model-specific fitment)