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Error code reference

Bosch Refrigerator Error Code 1100

Inverter error

Bosch codesBosch refrigerator codes

Inverter error: Motor asymmetry

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 1100 means on a Bosch refrigerator

Error code 1100 on a Bosch refrigerator indicates an inverter error related to motor asymmetry in the variable-speed compressor system. Bosch inverter-driven refrigerators use a digital inverter board to control the compressor motor by delivering precisely timed, three-phase-like power signals to the motor windings. Motor asymmetry means the inverter has detected an imbalance in the electrical load across the compressor motor windings, which can signal a fault in the wiring, connector integrity, the inverter board itself, or the compressor motor.

The inverter continuously monitors current draw and resistance balance across the compressor motor terminals during operation. When one or more motor windings presents a significantly different resistance or impedance compared to the others, the inverter interprets this as asymmetry and triggers the 1100 fault to protect the compressor from damage. Common contributors include corroded or loose connector pins between the inverter and compressor, damaged wiring in the harness, or internal winding failure within the compressor itself.

The first diagnostic step is a thorough inspection of all connectors and the wire harness running between the inverter board and the compressor. Technicians should check for pin corrosion, backed-out terminals, chafed insulation, or any sign of heat damage near the connector housings. If the wiring and connectors check out, the compressor motor windings should be tested for resistance balance across terminals, and the inverter board should be evaluated for output signal integrity before replacement decisions are made.

Source: manufacturer service documentation.

Common causes of 1100

  1. 01

    Loose or corroded connectors between inverter and compressor

    Wiring / connection

    Poor electrical contact at the connector pins can create uneven resistance across motor terminals, triggering the asymmetry fault. Inspect all connector housings for corrosion, bent pins, or loose seating and reseat or replace as needed.

  2. 02

    Damaged wire harness

    Part replacement

    Chafed, pinched, or broken wires in the harness between the inverter board and compressor can cause intermittent or uneven signal delivery to the motor windings. Visually trace the full harness length and use a multimeter to check for continuity and shorts.

  3. 03

    Failed or failing compressor motor windings

    Part replacement

    Internal winding degradation or an open winding within the compressor motor creates measurable resistance imbalance across terminals, which the inverter reads as asymmetry. Resistance testing across all compressor terminals can confirm this diagnosis.

  4. 04

    Faulty inverter board

    Part replacement

    The inverter board itself may be producing uneven output signals to the compressor motor, or its internal sensors may be misreading current draw. If wiring and compressor motor windings test within spec, the inverter board is the likely culprit.

See the test procedure for each cause

Frequently asked questions about 1100

What does 1100 mean on a Bosch refrigerator?
Error code 1100 on a Bosch refrigerator indicates an inverter error caused by motor asymmetry in the compressor system. The inverter board has detected an electrical imbalance across the compressor motor windings, which can stem from wiring issues, connector faults, or a failing compressor motor. The refrigerator shuts down this function to prevent further damage to the compressor.
Can I fix error code 1100 on my Bosch refrigerator myself?
Some homeowners with electrical knowledge can inspect and reseat connectors or check the wire harness for obvious damage. However, diagnosing motor winding resistance or evaluating the inverter board output requires a multimeter and comfort working near refrigeration components. Compressor or inverter board replacement should be handled by a qualified appliance technician.
Will resetting my Bosch refrigerator clear error code 1100?
A power reset may temporarily clear the error code, but if the underlying cause, such as a faulty connector, damaged harness, or failing compressor winding, has not been addressed, the 1100 code will return once the inverter detects the asymmetry again. Resetting is useful for ruling out a one-time glitch but should not substitute for a proper diagnosis.
Is it safe to use my Bosch refrigerator while it shows error code 1100?
It is not advisable to continue using the refrigerator while this error is active. The inverter shuts down compressor operation to prevent damage, which means the unit may not be maintaining safe food storage temperatures. Continuing to run it in a fault state can also risk further damage to the inverter board or compressor.
How much does it cost to repair a Bosch refrigerator with error code 1100?
Repair costs vary depending on the root cause. Connector or harness repairs are generally in the range of $100 to $250 including labor. An inverter board replacement typically runs between $200 and $450 depending on parts and labor rates. Compressor replacement is the most expensive scenario, often ranging from $400 to $800 or more, and may prompt a cost-versus-replacement evaluation for older units.

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