Bosch Dishwasher E01 Error Code — What It Means
The E01 error code on a Bosch dishwasher signals a heat pump motor circuit fault at the main control board. This is an electrical problem in the circuit that drives the heat pump or circulation pump motor, not a water-inlet issue. Bosch’s official documentation defines E01 as a fault in the motor circuit itself or in the control board’s output stage that powers it.
Some online videos incorrectly describe E01 as a filling or water-pressure problem, but that does not match Bosch’s published definition. The fault typically involves the heat pump motor assembly, the control board’s output driver, or damaged wiring and connectors in that circuit. Older units may develop this fault through normal component wear or moisture-related board damage.
Common Causes
- Failed heat pump or circulation pump motor circuit The motor itself or its internal windings can fail, creating an open or short that the control board detects as a circuit fault.
- Main control board fault The control board’s output stage that drives the heat pump motor can fail due to a damaged relay, transistor, or logic fault.
- Wiring or connector damage Moisture, heat, or physical wear can damage the harness or connectors between the control board and the pump motor, causing an open or intermittent circuit.
- Electrical short or power disturbance A short circuit in the motor wiring or a power surge can damage the motor circuit or the board’s output stage.
- Component wear in older dishwashers Normal aging of the pump motor or control board can cause the fault to appear and persist even after a reset.
Step-by-Step Fix
- Verify the exact model and FD number on your dishwasher’s rating plate so you confirm the correct error-code definition and service procedure for your unit.
- Reset power at the circuit breaker by switching off the breaker that feeds the dishwasher, wait 30 seconds, then switch it back on and check whether the E01 code clears.
- Run a short test cycle after the reset to see if the fault returns during operation or if the dishwasher completes the cycle normally.
- Inspect the heat pump and circulation pump wiring for visible damage, burned connectors, moisture, or loose plug connections at both the pump and the control board.
- Check the main control board for signs of heat damage, burned traces, or failed components near the motor-output terminals if the wiring and pump appear intact.
- Replace the defective component (pump motor assembly or control board) based on your findings, then perform a full test cycle to confirm the repair.
- Contact Bosch support or an authorized service technician if the code returns after a reset, because Bosch directs customers to professional service when the fault persists.
Parts Often Needed
| Part | Notes |
|---|---|
| Heat pump / circulation pump motor assembly | Amazon | Required if the motor circuit itself is open, shorted, or mechanically failed. |
| Main control board | Amazon | Needed when the board’s motor-output stage is damaged or the fault persists with a known-good pump. |
| Wiring harness or connector set | Amazon | Use if you find heat-damaged, corroded, or broken wiring between the board and pump. |
When to Call a Pro
Call a professional if the E01 code returns after a power reset at the breaker. Bosch recommends contacting authorized service when the fault persists because diagnosing the heat pump motor circuit requires model-specific test procedures, special tools, and access to wiring diagrams. The repair also involves working with live mains voltage and replacing either the pump assembly or the main control board, both of which require disassembly of the dishwasher tub and proper reassembly to maintain water-tight seals. If you are not comfortable with appliance disassembly or electrical diagnostics, schedule service rather than risk further damage or safety hazards.