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Error code reference

Bosch Refrigerator Error Code 0101

Inverter error

Bosch codesBosch refrigerator codes

Inverter error: Phase loss

First step from the service manual

Check connectors and wire harness between inverter and compressor

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What 0101 means on a Bosch refrigerator

Error code 0101 on a Bosch refrigerator indicates an inverter error caused by phase loss. The inverter board in these refrigerators controls the variable-speed compressor by converting DC power into a three-phase AC output. Each of these three phases must deliver the correct voltage and timing to the compressor motor windings. When one or more of those phases is absent or significantly degraded, the inverter detects the imbalance and triggers the 0101 fault to protect the compressor from running under abnormal electrical conditions.

Phase loss most commonly results from a failure in the wiring and connector path between the inverter board and the compressor. Connectors can develop corrosion, loose pins, or heat damage over time, causing an open circuit on one phase leg. The wire harness itself can suffer insulation damage, chafing against cabinet components, or breaks at stress points near the compressor housing. Because the inverter continuously monitors the output to the compressor, even an intermittent connection loss on a single phase wire will reliably trigger this code.

If the wiring and connectors are confirmed to be intact and in good condition, the fault may originate within the inverter board itself, where an internal output transistor or driver circuit for one phase has failed. Less commonly, the compressor motor windings may show an open or short on one phase, which would present as a winding resistance imbalance when checked with a multimeter. Diagnosis should begin at the connector and harness level before condemning the inverter board or compressor.

Source: manufacturer service documentation.

Common causes of 0101

  1. 01

    Loose or corroded connector between inverter and compressor

    Wiring / connection

    The multi-pin connector joining the inverter board output to the compressor harness is the most frequent failure point. Inspect each pin for corrosion, push-back, or loose retention, as even partial contact on one pin will cause phase loss.

  2. 02

    Damaged or broken wire harness

    Part replacement

    The harness running from the inverter to the compressor can develop breaks or chafed insulation, particularly at points where it flexes or contacts the cabinet. A visual inspection followed by continuity testing on each wire will confirm an open circuit.

  3. 03

    Failed inverter board output stage

    Part replacement

    If connectors and wiring test good, an internal failure of one phase output on the inverter board can cause this code. This typically requires replacing the inverter board.

  4. 04

    Open or shorted compressor motor winding

    Part replacement

    The compressor motor itself has three windings, and an open winding on one phase will mimic a phase loss condition. Use a multimeter to compare resistance values across all three winding terminals and look for significant imbalance or an open reading.

See the test procedure for each cause

Frequently asked questions about 0101

What does 0101 mean on a Bosch refrigerator?
Error code 0101 on a Bosch refrigerator signals an inverter phase loss fault. The inverter board produces a three-phase electrical output to drive the variable-speed compressor, and this code appears when one of those phases is missing or interrupted. The most common cause is a wiring or connector problem between the inverter and the compressor.
Can I fix error code 0101 on my Bosch refrigerator myself?
A knowledgeable DIYer can begin by inspecting and reseating the connectors and wire harness between the inverter board and the compressor, which is the recommended first diagnostic step. If the wiring checks out, further diagnosis involves testing compressor winding resistance with a multimeter. Replacing an inverter board or compressor is more involved and may be better suited to a certified technician.
Is it safe to keep using my Bosch refrigerator when error code 0101 is showing?
The refrigerator should not be relied on for food storage while this code is active because the compressor may not run correctly, meaning the unit may not maintain safe temperatures. The inverter fault protection is designed to prevent further damage to the compressor, so continued operation under this condition is not recommended.
How much does it cost to repair a Bosch refrigerator showing error code 0101?
Repair costs vary depending on the root cause. If the fix is a reseated connector or a replacement wire harness, costs are generally in the range of $50 to $200 including labor. An inverter board replacement typically runs between $150 and $400 for parts and labor. Compressor replacement is the most expensive outcome, often ranging from $400 to $800 or more depending on the model and service rates.
Will resetting my Bosch refrigerator clear the 0101 error code?
A power reset may temporarily clear the code, but it will return if the underlying phase loss condition is still present. Because the inverter continuously monitors its output to the compressor, any wiring fault or component failure that caused the original code will trigger it again during the next compressor start cycle. A reset is not a fix and should only be used as part of the diagnostic process.

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