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Bard part 8301-013 is an OEM current sensing control component used in Bard wall mounted air conditioners and heat pump units to verify electrical load and help the control system confirm proper operation during a call for heating or cooling. When a current sensor is weak, damaged, or out of calibration, it can cause nuisance lockouts, incorrect staging decisions, or failure diagnostics that do not match actual equipment performance. Replacing with the correct Bard 8301-013 restores dependable monitoring and keeps factory safeties and sequencing working as intended, but fit and wiring should be confirmed against your unit model and service literature before ordering.