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The Lennox 27L02 (EHAFB-10-P) is a genuine OEM heater sub-fuse box that provides critical overcurrent protection for the electric heat circuit in compatible Lennox HVAC systems. If your system experiences repeated fuse failures, no heat output, or tripped safety devices, the sub-fuse box may need replacement to restore safe and proper operation. This authentic Lennox replacement part ensures correct fit and reliable circuit protection in all applicable Lennox air handlers and electric heating systems.