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Bard part 8402-151 is an OEM limit control line break used in Bard wall-mount HVAC equipment to help protect the system by opening the control circuit if abnormal temperature conditions occur. In the field, these safety limit devices are commonly tied into the electric heat or heater control circuit, and a failed or nuisance-tripping limit can lead to no-heat complaints or intermittent shutdowns. Replacing it with the correct Bard OEM 8402-151 helps maintain proper safety operation and dependable unit performance, but you should always confirm the exact trip and reset characteristics from your unit model and wiring diagram before ordering or installing.