Bosch Dishwasher E27 Error Code

Household power supply too low. Here is what it means and how to clear it, easiest fix first.

E27

Moderate DIY

The dishwasher is seeing lower supply voltage than it needs. The cause is usually in the home's wiring or supply rather than the dishwasher itself.

Newer US models show E9001. European guides list E27 and E90 as power supply codes.

Safety first: unplug the dishwasher (or switch off its breaker) before touching filters, hoses or panels. If you smell burning or gas, or see water near the outlet, stop and call a professional.

How to fix Bosch E27

Reset the dishwasher at the breaker
Switch off the dishwasher's circuit breaker, wait about 30 seconds, then switch it back on. Run a short cycle with the dishwasher empty and watch whether the same code comes back. A code that clears and stays away was likely a one-time glitch.
Check the outlet
If your dishwasher plugs in, make sure it is plugged straight into its own outlet, not into an extension cord or power strip. Plug a lamp into the same outlet to see whether it works normally.

When to call a technician

If E27 returns, have an electrician check the voltage at the dishwasher's circuit. Do not open the dishwasher's electrical box yourself.

Other Bosch dishwasher codes

Frequently asked questions

What does E27 mean on a Bosch dishwasher?

The dishwasher is seeing lower supply voltage than it needs. The cause is usually in the home's wiring or supply rather than the dishwasher itself.

Can I fix Bosch E27 myself?

Often. The first steps above are safe checks a homeowner can do. If they don't clear E27, the cause is likely a worn part that needs replacing.

What if E27 keeps coming back?

A code that returns after a reset and the checks above usually means a part is wearing out. Note when E27 appears (which cycle, how often) and have your model number ready; it helps a technician bring the right part on the first visit.

Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.

References