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Error code reference

Bosch Dryer Error Code E:0100

Power Unit

Bosch codesBosch dryer codes

Power Unit - collective number for all system errors (Error) (4-digit equivalent of E:63).

First step from the service manual

Check electrical connections between motor and Power Unit.

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

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What E:0100 means on a Bosch dryer

E:0100 is a collective fault code on Bosch dryers that flags a system-level error within the Power Unit. The Power Unit is the main control board assembly responsible for managing motor operation, drum rotation, heating circuits, and overall drive coordination. This code serves as a broad umbrella designation, meaning the control system has detected one or more faults that fall under the Power Unit's monitored parameters. It is the 4-digit equivalent of error code E:63, and the two codes share the same root cause structure and diagnostic pathway.

Because E:0100 is a collective code, the fault could originate from several subsystems that report back through the Power Unit. The most critical first step is inspecting the electrical connections between the motor and the Power Unit. Loose, corroded, or damaged wiring harness connectors in this path are a frequent trigger, as the Power Unit continuously monitors motor feedback signals. If those signals fall outside expected parameters due to a wiring fault, the unit logs a system error rather than a more specific component fault.

Beyond wiring, actual component failures within the motor or the Power Unit itself can generate this code. A motor winding failure, a failed motor capacitor, or internal damage to the Power Unit's drive circuitry can all produce this collective error. Technicians should work from the connections inward, ruling out wiring and connector issues before condemning the motor or Power Unit, as board and motor replacements carry significantly higher parts and labor costs.

Source: manufacturer service documentation.

Common causes of E:0100

  1. 01

    Loose or damaged wiring connections between motor and Power Unit

    Wiring / connection

    Connectors in the motor-to-Power Unit harness can work loose over time due to vibration, or the terminals may corrode or sustain heat damage. This is the first point to inspect and is a common trigger for this collective fault code.

  2. 02

    Failed motor capacitor

    Part replacement

    The motor start or run capacitor can fail, causing the motor to draw abnormal current or fail to start properly. The Power Unit detects these irregular motor signals and logs a system error.

  3. 03

    Faulty drive motor

    Part replacement

    A motor with damaged windings or internal shorts will send out-of-range feedback to the Power Unit, triggering this collective error. Resistance testing of the motor windings can help confirm or rule out this cause.

  4. 04

    Internal Power Unit failure

    Part replacement

    The Power Unit's own drive circuitry or control components can fail, causing it to log a self-detected system error. This is typically diagnosed after wiring, capacitor, and motor have been ruled out.

  5. 05

    Intermittent power supply issue

    Wiring / connection

    Unstable or insufficient voltage reaching the Power Unit can cause it to register collective system faults. Checking the supply voltage and inspecting the power inlet connections is a useful secondary step.

See the test procedure for each cause

Frequently asked questions about E:0100

What does E:0100 mean on a Bosch dryer?
E:0100 is a collective Power Unit error code, meaning the dryer's main control board has detected one or more system-level faults. It is the 4-digit version of error code E:63 and covers a range of issues related to the Power Unit and its connected components. Because it is a collective code, further diagnosis is needed to identify the specific fault within the system.
How do I fix E:0100 on a Bosch dryer?
Start by unplugging the dryer and inspecting all electrical connections between the motor and the Power Unit, looking for loose terminals, corrosion, or damaged wiring. If connections are secure, testing the motor capacitor and motor windings for faults is the next step. If both check out, the Power Unit itself may need to be replaced by a qualified technician.
Is it safe to use my Bosch dryer when E:0100 is showing?
It is not recommended to continue operating the dryer while E:0100 is active. This code indicates a fault within the core electrical control system, and running the appliance could worsen an existing wiring or component issue. Discontinue use until the fault has been properly diagnosed and repaired.
How much does it cost to repair a Bosch dryer with error code E:0100?
Repair costs vary depending on the root cause. If the fix involves reseating a loose connector or replacing a motor capacitor, costs are typically in the range of $50 to $150 including labor. A motor replacement generally runs $150 to $350, while a Power Unit board replacement can range from $200 to $450 or more depending on parts availability and labor rates.
Will resetting my Bosch dryer clear the E:0100 error code?
A reset by unplugging the dryer for several minutes may temporarily clear the code, but it will return if the underlying fault is still present. E:0100 is a system-detected error that requires the actual cause to be identified and corrected for the code to stay cleared. A reset alone is not a repair and should only be used as part of the diagnostic process.

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