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BOSCH E:30 / -20

Bosch Washing Machine Error E:30 / -20: Excess Foam or Additional Water Detected

Clear meaning, realistic next steps, and safe guidance without turning the page into a long repair manual.

What it means

The machine has detected excessive foam in the drum, or additional water was introduced mid-cycle, causing an abnormal water level reading.

Severity

Low - usually safe to check with basic user-accessible cleaning or inspection on the Bosch washing machine.

Can you fix it yourself?

Yes — DIY-safe

Most likely cause

Too much detergent used for the load size

Estimated time for safe first checks: 5–10 min.

Step-by-Step DIY Fix Guide

  1. SAFETY: Leave the machine running — do not interrupt mid-cycle.
  2. Mix 1 tablespoon of fabric softener with 2 cups (0.5 liters) of water.
  3. Pour the mixture into compartment II of the detergent drawer.
  4. Do not add this mixture if washing outdoor clothing, sportswear, or down items.
  5. Allow the cycle to complete — the machine will rinse out excess foam.
  6. For the next wash, reduce detergent dose by 25–50%.
  7. Switch to an HE-certified detergent formula.

If it's still not filling correctly

  • If normal household water flow looks good but the code returns, the inlet-valve or fill-sensing path becomes more likely.
  • If airflow still seems weak after the basic checks, the fan path or a deeper obstruction becomes more likely.
  • If the warning returns immediately after a clean restart, the sensor or wiring path becomes more likely than a one-time glitch.

What This Error Means

E:30 / -20 on your Bosch washing machine means: The machine has detected excessive foam in the drum, or additional water was introduced mid-cycle, causing an abnormal water level reading. The machine detects this condition via its sensors and stops the current cycle to prevent further damage. The error will remain until the underlying cause is resolved.

The most frequent cause is too much detergent used for the load size. Work through the causes listed below in order — the first cause is the most likely and the most straightforward to check.

Error E:30 / -20 is DIY-safe for most homeowners. The fix typically takes under 30 minutes and requires no specialist tools. Follow the steps below exactly — skipping steps is the most common reason the error returns.

The drum will remain empty or partially filled, and the wash cycle will not progress. Turn off the water tap before inspecting the inlet hose or filters.

Most Likely Cause by Symptom

The Bosch washing machine may stop, pause, or refuse to complete the cycle normally.

Likely cause: Too much detergent used for the load size

Check first: SAFETY: Leave the machine running — do not interrupt mid-cycle.

Performance may drop because airflow, filtering, or draining is restricted.

Likely cause: Wrong type of detergent — non-HE formula in an HE front-loader

Check first: Mix 1 tablespoon of fabric softener with 2 cups (0.5 liters) of water.

Excess foam or detergent residue may be visible.

Likely cause: Old or degraded detergent foaming excessively

Check first: Pour the mixture into compartment II of the detergent drawer.

Common Causes

  • Too much detergent used for the load size
  • Wrong type of detergent — non-HE formula in an HE front-loader
  • Old or degraded detergent foaming excessively
  • Water manually added during cycle

What Not to Do

  • Do not add detergent manually mid-cycle

Model and Display Variation Notes

Model-family notes

  • Bosch washing machine display wording and code formats can vary by series.
  • If your model behaves differently, check the owner manual before trying any deeper maintenance step.

Display and panel differences

  • Panel wording can vary by series, so confirm the exact code pattern before buying parts.

Parts, Tools and Service Options

Manual and model check

Check your exact model and manual before ordering any Bosch washing machine parts.

This section stays model-first because exact manual and parts matching matters more than a generic replacement suggestion here.

When Not to Keep Troubleshooting

E30-20 recurs consistently despite using correct HE detergent at recommended dose — foam sensor may need inspection

How to Prevent It Recurring

  • Use HE-certified detergent at the recommended dose
  • Reduce detergent for small or lightly soiled loads

Related Error Codes

Extra notes

  • This page is based on Bosch support material and stays conservative where model-specific guidance may vary.
  • The goal is to help you identify safe first checks before you move into parts, service, or model-specific manual lookup.

Source and model notes

Last reviewed: 2026-04-07

Based on: Based on Bosch support material and edited into consumer-safe guidance for the exact code family on this page.

View Bosch US Official

Model coverage note: Bosch washing machine code meanings can vary by series, control panel, and model family, so use this page as a safe starting point rather than a replacement for the model-specific manual.

Important: FixThisError is an independent guide, not the manufacturer. Use your model-specific manual when the panel wording or behavior differs.

Always disconnect power before inspecting appliances. If unsure, contact a licensed appliance technician.