Lennox 28W70 Defrost Sensor with Harness

The Lennox 28W70 is an OEM replacement defrost sensor complete with wiring harness, engineered to restore precise defrost cycle operation in compatible Lennox heat pump and refrigeration systems. By accurately monitoring coil temperatures, this sensor signals the defrost control board at the correct time — preventing ice buildup, protecting system components, and maintaining peak efficiency throughout the heating season.

Key Features

• OEM Lennox replacement part — ensures proper fit and function
• Includes pre-attached wiring harness for simplified installation
• Monitors coil temperature to initiate and terminate defrost cycles accurately
• Helps prevent ice accumulation on outdoor coils
• Protects compressor and refrigerant circuit from freeze-related damage
• Restores system efficiency and extends equipment service life

Application

• Designed for use in compatible Lennox heat pump systems
• Direct OEM replacement — no modifications required
• Ideal for HVAC technicians performing defrost system diagnostics and repairs

Why Choose the Lennox 28W70?

Using a genuine OEM defrost sensor ensures your Lennox system operates exactly as designed. Third-party sensors may not match the precise temperature response curve required by the defrost control board, leading to short cycling, excessive icing, or compressor damage. The 28W70 eliminates guesswork with a plug-and-play harness connection, reducing installation time and the risk of wiring errors.