E01 — Control board fault
Per Bosch's official US error-code page, E01 means there is a heat pump motor circuit fault at the main control board. Bosch's first recommended step is to reset power at the breaker for 30 seconds.
- Keep using it?
- Limited use only
- DIY difficulty
- Hard
- Typical cost
- $150-300
- Verified against
- bosch-home.com ↗
The fix
Main control board
Heater relay / control board fault
Diagnose first: Control board cannot verify heater circuit; often the relay on the board itself has failed.
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How to fix it
- Hard reset: switch off at the breaker for 5 minutes, then restore power.
- Open the door top and inspect the control module area for moisture or staining.
- Re-seat the ribbon cable between the user interface and main PCB.
- Run a Rinse-only program to see if the fault returns.
- If E01 persists, the main control module typically requires replacement (Bosch part number specific to model).
Why it happens
Typical signs: Cycle stops mid-program · Dishwasher resets itself · Display freezes or blanks · Buttons unresponsive
- Control module failure PCB internal fault, often after power surge or moisture intrusion under the lid.
- Moisture in control housing Water from a leaking door seal reached the upper control board.
- Power supply problem Unstable house voltage tripping the brownout watchdog.
- Wiring harness fault Loose or corroded connector between PCB and user interface.
More Bosch dishwasher codes
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: bosch-home.com.