Bosch Refrigerator Error Code 1000

Error code 1000 on a Bosch refrigerator indicates an inverter error specifically related to the current null range. The inverter board controls the variable-speed compressor, converting DC power into the precisely regulated AC signals needed to drive the compressor motor at different speeds. The "current null range" fault means the inverter has detected that the compressor motor current is not returning to zero at the expected point in the AC cycle, which signals a breakdown in the inverter's ability to properly commutate or control the compressor motor winding current.

This type of fault typically points to a failure within the inverter board itself, where the internal current sensing circuitry or the power switching components (such as IGBTs or MOSFETs) are no longer functioning correctly. The inverter may be unable to accurately detect or regulate the current waveform being delivered to the compressor. In some cases, a failed or shorted compressor winding can also create abnormal current behavior that the inverter interprets as a null range fault, though the inverter board is the primary suspect.

Because the inverter is directly responsible for compressor operation, this fault will typically result in the compressor failing to run, which means the refrigerator will stop cooling entirely. The diagnostic guidance for this code points directly to inverter replacement as the first and most likely corrective action, reflecting that internal inverter board failures are the most common root cause of this specific current-related fault.