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Error code reference

Bosch Dryer Error Code E:9003

Power supply

Bosch codesBosch dryer codes

Power supply - line voltage too low or too high, or window opened while process running (Error) (4-digit equivalent of E:92).

First step from the service manual

Check mains voltage using measuring device with memory card.

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

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What E:9003 means on a Bosch dryer

Error code E:9003 on a Bosch dryer is a power supply fault that triggers when the unit detects line voltage that falls outside the acceptable operating range, either too low or too high relative to the dryer's rated input requirements. This code is the 4-digit equivalent of the shorter E:92 code and belongs to the electrical supply monitoring system built into the dryer's control board. The control electronics continuously sample incoming mains voltage and will halt operation and display this error if the supply deviates beyond safe thresholds.

A second trigger condition for E:9003 is a door or access window being opened while a drying cycle is actively running. The dryer treats an unexpected window or door opening during operation as a process interruption event, which is grouped under this same error category. This means the code can appear due to either an electrical supply problem or a physical interruption of the running cycle.

The recommended first diagnostic step is to measure the incoming mains voltage at the dryer's supply point using a measuring device equipped with a memory card, which allows you to log voltage over time and catch intermittent dips or surges that a simple instantaneous reading might miss. This approach is important because low voltage events caused by grid fluctuations or overloaded household circuits can be transient and hard to detect without data logging. If voltage is confirmed within spec and no door event occurred, the fault may point toward the control board's voltage sensing circuitry.

Source: manufacturer service documentation.

Common causes of E:9003

  1. 01

    Low or unstable mains voltage

    Wiring / connection

    Voltage sags caused by a heavily loaded household circuit, a weak utility supply, or a long or undersized power cord can drop voltage below the dryer's minimum threshold. Use a logging multimeter to capture voltage over time and confirm the supply is stable.

  2. 02

    High mains voltage or voltage spike

    Wiring / connection

    Surges from the utility grid or sudden large load disconnections in the home can push voltage above the dryer's upper limit, triggering the fault. Check the supply voltage at the outlet and compare it to the dryer's rated input specification.

  3. 03

    Door or access window opened mid-cycle

    Wiring / connection

    Opening the dryer door or any access panel while the drum is running will trigger E:9003 as a process interruption event. Confirm that the door latch is functioning correctly and that the door was not opened accidentally during the cycle.

  4. 04

    Faulty door latch or door switch

    Part replacement

    A worn or broken door latch can cause the control board to falsely detect a door-open condition even when the door is physically closed, generating this error repeatedly. Inspect the latch mechanism and the door switch for continuity and proper engagement.

  5. 05

    Control board voltage sensing fault

    Part replacement

    If mains voltage is confirmed within range and no door event has occurred, the voltage sensing circuit on the main control board may be reading incorrectly. This would require control board inspection or replacement.

See the test procedure for each cause

Frequently asked questions about E:9003

What does E:9003 mean on a Bosch dryer?
E:9003 is a power supply error indicating that the dryer has detected incoming mains voltage outside its acceptable range, either too low or too high. It can also be triggered if the door or access window was opened while a drying cycle was in progress. This code is the 4-digit version of the E:92 fault code and involves the dryer's electrical supply monitoring system.
How do I fix error E:9003 on my Bosch dryer?
Start by measuring the mains voltage at the outlet using a multimeter, ideally one with a logging or memory function to catch intermittent fluctuations. Confirm the voltage is stable and within the dryer's rated input range. If the error appeared after a door was opened mid-cycle, close the door firmly and attempt to restart. If the error persists with correct voltage and a properly closed door, inspect the door latch and switch for damage or misalignment.
Is it safe to use my Bosch dryer when E:9003 is showing?
You should not continue operating the dryer while this error is active. Low or high voltage conditions can damage the motor, heating element, and control electronics over time. The dryer halts the cycle specifically to protect its components, so resolve the underlying voltage or door issue before resuming use.
Will resetting the dryer clear the E:9003 error?
A reset may temporarily clear the display, but the error will return if the root cause is not addressed. If the supply voltage is outside specification or the door latch is faulty, the control board will detect the same condition again and re-trigger the fault. Fix the underlying problem before relying on a reset to resume normal operation.
How much does it cost to repair a Bosch dryer with error E:9003?
Repair costs vary depending on the cause. If the issue is a low household voltage supply or a tripped breaker, there may be no parts cost at all. A door latch or door switch replacement typically ranges from $20 to $80 in parts plus labor. If the main control board requires replacement, costs can range from $150 to $350 or more depending on the specific model and service rates in your area.

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