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The defrost sensor is a critical safety and efficiency component in heat pumps and certain boiler systems, detecting ice buildup on outdoor coils. It signals the system to initiate a defrost cycle, preventing performance loss and potential damage. A defective sensor can cause unnecessary defrost cycles or allow ice accumulation, reducing efficiency. Replacing it with a reliable sensor ensures accurate frost detection and timely defrosting, protecting your equipment and maintaining optimal operation. Designed to withstand outdoor conditions, this sensor offers dependable performance. Verify electrical specifications and mounting requirements for a proper fit in your specific heating system.