Step-by-Step DIY Fix Guide
- SAFETY: Leave the machine running — it will rinse out excess foam automatically.
- Mix 1 tablespoon of fabric softener with 2 cups (0.5 liters) of water.
- Pour the mixture into compartment II of the detergent drawer to help suppress foam.
- Do not add this mixture if washing outdoor clothing, sportswear, or down items.
- Allow the cycle to complete.
- For the next wash, reduce the detergent dose by at least 25–50%.
- Switch to a concentrated HE-certified detergent.
If the warning comes back after restart
- If the door closes normally but the warning keeps returning, the latch or switch path becomes more likely than a simple alignment issue.
- 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
E33 on your Bosch washing machine means: The washing machine has detected detergent foam overflowing from the detergent drawer, caused by too much detergent or an old detergent formula. 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 or soil level. Work through the causes listed below in order — the first cause is the most likely and the most straightforward to check.
Error E33 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.
You may see suds visible through the door glass or foam escaping from the detergent drawer. Do not stop the cycle — let the machine rinse the foam out automatically.
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 or soil level
Check first: SAFETY: Leave the machine running — it will rinse out excess foam automatically.
Excess foam or detergent residue may be visible.
Likely cause: Old or expired detergent foaming excessively
Check first: Mix 1 tablespoon of fabric softener with 2 cups (0.5 liters) of water.
The appliance may fail to start because the door or lock state cannot be confirmed.
Likely cause: Non-HE (non-High-Efficiency) detergent used in a front-loading HE machine
Check first: Pour the mixture into compartment II of the detergent drawer to help suppress foam.
Common Causes
- Too much detergent used for the load size or soil level
- Old or expired detergent foaming excessively
- Non-HE (non-High-Efficiency) detergent used in a front-loading HE machine
- Very lightly soiled load with a full detergent dose
What Not to Do
- Do not stop the cycle mid-wash
- Do not add more detergent
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
E33 occurs with correct detergent amounts and HE formula — foam sensor inspection needed
How to Prevent It Recurring
- Use only HE-certified detergent
- Check detergent packaging for dosage guidance — reduce for small or lightly soiled loads
- Check the best-before date on detergent packaging
Related Error Codes
F33
Same fault as E33 — excess foam on F-code model variants.
Foam/Bubbles Icon
The washing machine has detected too much foam inside the drum, usually caused by too much or the wrong type of detergent.
E:30 / -20
The machine has detected excessive foam in the drum, or additional water was introduced mid-cycle, causing an abnormal water level reading.
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.
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.