- Appliances
- Washing machines
F33
Bosch F33 on washing machine: too much detergent foam
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
Your Bosch washer shows F33 (or E33) because it detects detergent foam, from using too much or an old detergent. Reduce the dose on the next wash, especially for lightly soiled laundry, and follow the dosing on the pack.
Safety first
Stop and check this first
- If foam comes out of the detergent compartment, dry the floor before using the washer again: water near the socket is a hazard.
Safe checks you can perform
- Dose against the pack
- Detergent condition
- Test wash with a lower dose
Leave these tasks to a qualified professional
- Do not attempt this professional task: Service if foam continues with a low dose
- Do not attempt this professional task: Test after any repair
What a technician must be able to justify
A technician is coming
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Service if foam continues with a low dose
What they doIf F33 appears with a reduced dose and new detergent, Bosch service checks why the control detects foam.
They must show youthe code reproduced with a reduced dose.
In writingthe check performed and its result.
Test after any repair
What they doThe technician completes a wash at the recommended dose to check F33 does not return.
They must show youthe wash finished without F33.
In writingthe test result.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Checks and evidence, step by step
Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
- 1
Dose against the pack
No special tools
Procedure
- Who:
- you.
- How:
- compare the amount you used with the dose on the detergent pack for that load and soil level, as Bosch asks.
- Result that matters:
- knowing whether the dose was high.
- If it was high:
- that is the cause; use less next time.
- If it matched the pack:
- check the detergent age and how soiled the laundry was.
- Evidence to keep:
- a note of the detergent and amount.
Evidence: Bosch Washer Error Codes
- 2
Detergent condition
No special tools
Procedure
- Who:
- you.
- How:
- check how long the detergent has been open and whether it looks different.
- Result that matters:
- ruling out an old detergent, which Bosch names as a cause.
- If it is very old:
- replace it with a new one and test.
- If it is recent:
- old detergent is ruled out.
- Evidence to keep:
- a photo of the pack with its date if it has one.
Evidence: Bosch Washer Error Codes
- 3
Test wash with a lower dose
No special tools
Procedure
- Who:
- you.
- How:
- run the next wash with less detergent, especially if the laundry is lightly soiled, as Bosch instructs.
- Result that matters:
- whether F33 appears again.
- If it does not:
- the dose was the cause; keep the reduced amount.
- If it appears with a low dose and new detergent:
- note each case and contact Bosch service.
- Evidence to keep:
- notes for each wash with dose and result.
Evidence: Bosch Washer Error Codes
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Appliances
- Brand
- Bosch
- Product type
- Washing machines
Known code variants
- anomalía F33 Miele
- anomalie F33 Miele
- Bosch E33 espuma
- Bosch E33 foam
- Bosch F33 lavadora
- Bosch F33 washer
- Bosch washer F33 error
- code erreur F33 lave-vaisselle Miele
- E33
- error F33 lavadora Bosch
- error F33 lavavajillas Miele
- errore F33 lavastoviglie Miele
- Fehlercode F33 Miele
- guasto F33 Miele
- Miele dishwasher F33
- Miele F33
- Miele fault F33
- Miele Geschirrspüler Fehler F33
What it means
Bosch defines E33 and F33 as detergent foam detected: the washer control senses more foam than normal. Bosch documents it on its US washer page. According to Bosch, it comes from too much detergent or an old detergent, may cause foam to come out of the detergent compartment and is more likely when washing lightly soiled items. Its fix is to reduce the amount of detergent, especially for lightly soiled laundry, and follow the dose on the pack. It is not a breakdown: the code points to dosing, not to a part.
Warnings and stop conditions
- Loweditorial warning
If foam comes out of the detergent compartment, dry the floor before using the washer again: water near the socket is a hazard.
Evidence: Bosch Washer Error Codes
Symptoms and causes
Probable causes · in order
- Too much detergentCommon
The dose was more than the load needed. It is the main cause Bosch gives and the code does not return once the dose is reduced.
Evidence: Bosch Washer Error Codes
- Old detergentPossible
The detergent has been open for a long time. Bosch names it as a foam cause even when the dose looks normal.
Evidence: Bosch Washer Error Codes
- Lightly soiled laundry with a normal dosePossible
With lightly soiled laundry, the usual dose makes more foam. Bosch says the code is more likely in that case.
Evidence: Bosch Washer Error Codes
Virtual technician
Does F33 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Bosch · 2026 · official_doc
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