Bosch Dishwasher Error Code E12: Meaning & How to Fix It

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

Bosch dishwasher error code E12 means: Limescale has built up in the heat pump, and the dishwasher needs descaling. [1] Keep using it? Descale it before regular use. Start with the owner checks below, beginning with: descale the dishwasher.

Quick facts

Code	E12
Also shown as	E2060
Brand / appliance	Bosch dishwasher
System	Heating
Official meaning	Limescale has built up in the heat pump, and the dishwasher needs descaling. [1]
Keep using it?	Descale it before regular use
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 E12 means on a Bosch dishwasher

Limescale has built up in the heat pump, and the dishwasher needs descaling. [1]

This is a heating 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 E12 (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.

Descale the dishwasher. Run a descaling treatment made for dishwashers, following the product and owner's-manual directions.
Use softening salt. If your model has a water softener, keep the salt reservoir filled to slow future build-up, especially in hard-water areas.

Parts that may be involved

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

Dishwasher descaler
Dishwasher softening salt

When to call a technician

E12 returns after descaling
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 E12 mean on a Bosch dishwasher?

Bosch lists E12 as follows: Limescale has built up in the heat pump, and the dishwasher needs descaling.

Is it safe to keep using the dishwasher with E12?

Descale it before regular use.

Can I fix Bosch dishwasher error E12 myself?

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

Is E2060 the same as E12?

Yes. Bosch's documentation lists E2060 with the same meaning as E12; 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.