Description
The Lennox 47K19 is an OEM replacement defrost sensor engineered specifically for compatible Lennox heat pump systems. Designed to monitor outdoor coil temperatures, this sensor signals the defrost control board to initiate and terminate defrost cycles at the correct intervals — protecting system efficiency and preventing coil ice buildup during cold-weather operation.
Key Features
- OEM Lennox replacement defrost sensor
- Monitors outdoor coil temperature to trigger accurate defrost cycles
- Helps prevent ice accumulation on the outdoor coil for consistent heat pump performance
- Direct drop-in replacement for compatible Lennox heat pump models
- Supports reliable, efficient cold-weather heating operation
Why Replace Your Defrost Sensor?
A faulty defrost sensor can cause a heat pump to run continuous defrost cycles, fail to defrost at all, or operate inefficiently in cold temperatures. Replacing a worn or failed sensor with a genuine Lennox 47K19 restores proper defrost control, protects the outdoor coil, and maintains system efficiency throughout the heating season.
Application
- Compatible with select Lennox heat pump systems — verify compatibility with your unit’s model and serial number before ordering
- Recommended for use by qualified HVAC technicians
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