Bosch Dishwasher Error Code E27: Meaning & How to Fix It

By the ErrorCodePro Editorial Team · Last reviewed October 20, 2026

Bosch dishwasher error code E27 means: The house power supply to the dishwasher is too low. [1] Keep using it? Not until the supply is checked. Start with the owner checks below, beginning with: reset the power.

Quick facts

Code	E27
Also shown as	E9001
Brand / appliance	Bosch dishwasher
System	Power supply
Official meaning	The house power supply to the dishwasher is too low. [1]
Keep using it?	Not until the supply is checked
DIY-safe?	Owner checks only (listed below)
Support	Bosch Customer Support: 1-800-944-2904

On this page: Meaning · Steps · Parts · When to call a technician · Related codes · FAQ

What error code E27 means on a Bosch dishwasher

The house power supply to the dishwasher is too low. [1]

This is a power supply code. Codes and wording can vary by model, so check your owner's manual for your model number.

How to fix Bosch dishwasher error code E27 (safe owner checks)

Safety first: disconnect power before you remove any panel or reach into the sump or drum. Do not touch wiring, the control board or the motor. If you see water near electrical parts, stop and call a technician. These steps are based on Bosch's published guidance [1], rewritten for clarity.

Reset the power. Switch off the breaker (or unplug) for about 30 seconds, then restore power and try a cycle.
Have the voltage checked. If it returns, have a licensed electrician check the incoming voltage to the appliance.

Parts that may be involved

Exact parts depend on your model number. This page lists part types only, never part numbers.

No specific part is implied by the manufacturer's guidance for this code.

When to call a technician

Any electrical supply check: use a licensed electrician
Anything involving wiring, the control board, the motor or the water valve electrics
The appliance is under warranty: contact Bosch Customer Support: 1-800-944-2904 first

Frequently asked questions

What does error code E27 mean on a Bosch dishwasher?

Bosch lists E27 as follows: The house power supply to the dishwasher is too low.

Is it safe to keep using the dishwasher with E27?

Not until the supply is checked.

Can I fix Bosch dishwasher error E27 myself?

Only with the owner checks on this page, starting with: reset the power. If it persists, call a technician or Bosch Customer Support: 1-800-944-2904.

Is E9001 the same as E27?

Yes. Bosch's documentation lists E9001 with the same meaning as E27; the display format depends on the model.

Sources

Bosch Home US: Dishwasher Error Codes (official)

Last reviewed: October 20, 2026. ErrorCodePro is not affiliated with Bosch.