Bosch Dishwasher Error Code E27
The dishwasher itself is not faulty here: the voltage arriving at the machine has dropped below what it needs to run safely, so it stops. This can happen when several heavy appliances run at once or when there is a problem with the home's supply. If it happens often with nothing else running, an electrician should check the incoming supply.
Also shown as: E9001
Common causes
- Voltage drop when other large appliances run
- Overloaded household circuit
- Fault in the home's electrical supply
- Loose connection at the socket or breaker
What to check, in order
- Try running the dishwasher when other heavy appliances, such as the oven and tumble dryer, are off.
- Reset power at the breaker for 30 seconds and start the cycle again.
- Check whether lights dim or other appliances misbehave at the same time, which points to a supply issue.
- If low voltage recurs on its own, have an electrician check the supply to the appliance.
Clear the code and test
- Fix what the checks above found first — a filter cleaned, a hose straightened, the spray arms freed. Clearing the code without fixing the cause only brings it back.
- Close the door, plug the dishwasher back in (or restore its breaker) and make sure the water tap is open.
- Run the shortest programme and stay nearby for the first minutes, watching for leaks and listening for the drain pump.
- If the programme finishes with no code, the fault is cleared. If the code returns, write down the code and when it appeared before calling a technician — it speeds up the diagnosis.
When to call a professional
This display is not a fault, so there is normally nothing to book. Call a technician only if the machine also behaves abnormally, or if any of these apply:
- The code comes back after you have run the checks and a test cycle.
- You smell burning, see sparks or scorch marks, or the breaker trips.
- Water is leaking and you cannot stop it at the tap.
- The fix needs panels opened beyond what your manual describes, or a part tested with a meter, and you are not set up for that.
When you call, give the brand, the code E27, your model number (on a label inside the door or on the back) and the checks you already ran. It shortens the visit.
Parts that may be involved
Household power supplySocket and breaker circuit
Parts are model-specific. Find your model number first — usually on a label inside the door, on the door frame or on the back — and match the part to that number before ordering.
Questions people ask about E27
What does E27 mean on a Bosch dishwasher?
E27 means: Household power supply voltage is too low. The dishwasher itself is not faulty here: the voltage arriving at the machine has dropped below what it needs to run safely, so it stops. This can happen when several heavy appliances run at once or when there is a problem with the home's supply. If it happens often with nothing else running, an electrician should check the incoming supply.
Can I fix Bosch E27 myself?
There is nothing to fix: code E27 is a status display, not a fault. The checks on this page show how to exit the mode or confirm the setting.
How do I clear Bosch E27?
Fix the cause first — clearing the code on its own brings it straight back. Then restore power and water, run the shortest programme, and watch the stage where the code appeared. If the programme finishes with no code, it is cleared.
Sources checked
- Bosch Home (US) owner support: dishwasher error codes
- Coolblue advice: Bosch and Siemens washing machine errors
The meaning and checks for this code were checked against the sources above in November 2026. Codes vary by model and region; if your manual lists a different meaning for your exact model, follow the manual.