Bosch Dishwasher Error E12

⚡ Quick Answer: The Bosch dishwasher error E12 indicates a water leakage detection problem, typically caused by limescale or mineral buildup in the heat pump or heati... ✅ DIY Fixable

What Does Error E12 Mean?

The Bosch dishwasher error E12 indicates a water leakage detection problem, typically caused by limescale or mineral buildup in the heat pump or heating element. This leads to slow or insufficient water heating, with the cycle potentially stopping until the issue is resolved. A persistent beeping sound accompanies this error, signaling the need for immediate attention to restore optimal heating performance.

Common Symptoms:

  • Dishwasher displays E12 code on panel
  • Slow or insufficient water heating
  • Cycle may stop or be interrupted until issue addressed

Possible Causes

  • Limescale / mineral buildup on heat pump / heating element (high)

How to Fix Error E12

DIY Fix Descale dishwasher to remove limescale

  1. Purchase a dishwasher descaler suitable for Bosch models (e.g., Bosch quick descaler).
  2. Follow product instructions to run a descaling cycle (often an empty wash cycle with descaler).
  3. After descaling, run a normal cycle to clear residues.

DIY Fix Use water softening measures

  1. If your dishwasher model supports water softening salt, ensure the salt reservoir is filled.
  2. Use softer water or softening products in regions with hard water.
  3. Perform regular maintenance descaling at manufacturer‑recommended intervals.

Technician Only Inspect heating element and heat pump system

  1. Disconnect power and water supply.
  2. Inspect the heating element / heat pump for heavy scaling or damage.
  3. Clean or replace components if descaling does not resolve the issue.

Parts needed: Heating element, Heat pump assembly

🛑 When to Call a Pro:
  • If descaling does not clear the error after multiple attempts.
  • If dishwasher displays additional errors alongside E12.
  • If heating element inspection reveals damage or failure.

Technical Specifications

wattage 1440W
component Leakage sensor
resistance 10-20 ohms
part_number Bosch 00720279
voltage_rating 120V AC

Common Questions

What does E12 error mean on bosch dishwasher?

The E12 error indicates a water leakage detection issue caused by limescale buildup, affecting the heating performance.

Can I fix bosch dishwasher E12 error myself?

Yes, you can descale the dishwasher using a suitable descaler and ensure regular maintenance to prevent future issues.

How much does it cost to fix E12 error?

Repair costs for the E12 error typically range from $50 to $200+, depending on parts and labor.

When should I call a technician for E12?

Call a technician if descaling does not resolve the error, if additional errors appear, or if the heating element is damaged.

Sources & References

Data last verified: 2026-01-16

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