Bosch Refrigerator Error Code 0100

Error code 0100 on a Bosch refrigerator indicates an inverter error caused by a locked rotor condition in the compressor. The inverter board controls the variable-speed compressor motor by sending precisely timed electrical signals to drive the motor windings. When the inverter detects that the compressor rotor is not spinning in response to those drive signals, it registers a locked rotor fault and shuts down the compressor to prevent thermal and electrical damage to the system.

A locked rotor condition means the compressor motor is receiving power but the internal rotor is not rotating. This can occur because the rotor is mechanically seized due to internal compressor failure, because the start conditions are outside acceptable parameters, or because the electrical path between the inverter and compressor is compromised. The inverter monitors current draw and rotor position feedback continuously, and any deviation from expected rotation triggers this fault code immediately.

The first diagnostic step is to inspect all connectors and the wire harness running between the inverter board and the compressor. Loose, corroded, or damaged connections can interrupt the drive signals or position feedback signals, causing the inverter to misread the compressor state as a locked rotor even when the compressor itself is mechanically sound. If the wiring checks out, further diagnosis moves to testing the compressor windings and the inverter board output signals to isolate whether the fault is electrical or mechanical in origin.