What to check yourself
Step 1. Check what else is on the same circuit
A dishwasher sharing a circuit with a microwave, a kettle or a space heater can see the voltage sag every time the other appliance kicks in. If the code appears at predictable times of day, that is the pattern.
Step 2. Take it off any extension lead or power strip
A dishwasher should be plugged straight into its own outlet. Extension leads and strips drop voltage under load, and a long thin one drops a lot.
Step 3. Ask whether the whole house is affected
Look for lights dimming when large appliances start, or other equipment behaving oddly. A supply problem across the house is a job for the utility or an electrician, not an appliance technician.
What a technician will look at
Described so you know what you are paying for, not as steps to repeat.
Have the outlet and circuit checked
An electrician can measure the voltage at the outlet under load, which settles in ten minutes whether the fault is the house or the machine.
When to call a technician
Call an electrician before an appliance technician. If the voltage at the outlet is correct under load, then the fault is inside the machine and the appliance visit is justified.
What the repair costs
| Repair | Part only | Fitted by a technician |
|---|---|---|
| Moving the machine to its own outlet | - | Free |
| Electrician checking the circuit | - | $100 to $250 |
| Control board replacement, if the machine is at fault | - | $300 to $550 |
A new machine of the same class runs $500 to $1,500. Once a quote passes about a third of that on an older appliance, the repair stops making sense.
Codes people confuse this with
Questions people ask
- It only happens in the evening.
- That fits a shared circuit or a supply that sags at peak demand. Note the times before calling anyone: it turns a vague complaint into something an electrician can actually chase.
Which machines this applies to
Applies to
All Bosch dishwashers. Machines with newer electronics show E9001 for the same fault.
Last checked
2026-08-04