Bosch Washer E33 — What It Means & How to Fix It
Also shown as F33 on some models.
Bosch's E33 — shown as F33 on some models — means the machine detected excessive foam, nearly always from too much detergent or the wrong (non-HE) type, which makes the wash slow down or pause while it deals with the suds.
What this code means
Bosch washers are high-efficiency machines that use very little water, so ordinary or over-dosed detergent whips up far more foam than the drum can handle, and E33 is the sensor flagging it. A lightly soiled load that doesn't use up the detergent, or a scoop sized for a top-loader, are the common triggers — the machine adds rinses to clear the suds, which is why the cycle drags on.
E33 and F33 are the same suds detection on Bosch washers. It isn't a hardware fault — it responds directly to how much and what kind of detergent went in, so the fix is in the dispenser drawer, not the machine.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Too much detergent for the load size | Very common | Yes — no tools |
| Non-HE detergent used in an HE machine | Common | Yes — no tools |
| Lightly soiled load leaving detergent unspent | Common | Yes — no tools |
| Residual soap buildup from past overdosing | Occasional | Yes — rinse cycle |
| Faulty sensor reading foam that isn't there | Less common | No — technician job |
What you can try yourself
- Let the machine finish its extra rinses if it's mid-cycle — it's actively trying to clear the foam and often recovers on its own.
- If it's stuck, run a rinse-and-spin with no detergent to flush the remaining suds out of the drum.
- Next wash, measure the detergent to the line for your load size and water hardness, and use noticeably less for small or lightly soiled loads.
- Check the bottle says HE or shows the he symbol; standard detergent foams far too much in a low-water Bosch and should be swapped out.
- If E33 shows even with a correct HE dose and a clean drawer, the foam sensor may be misreading and needs a technician.
When to call a technician
- E33 appears even after switching to a small, correct HE dose.
- The drum is visibly foam-free but the code persists.
- Suds keep building over several washes despite rinse cycles, hinting at a sensor or drainage fault.
Typical professional repair cost: Free to resolve with dosing changes; a foam-sensor or control diagnosis, if it comes to that, runs $80–$180.
Frequently asked questions
How do I get rid of E33 suds on my Bosch washer?
Run a rinse-and-spin with no detergent to flush the foam out, then cut back your detergent next time and make sure it's an HE type. The code is the machine reacting to more suds than its low-water wash can rinse away.
Does E33 mean my Bosch washer is broken?
Usually not. It's a suds warning tied to detergent, not a hardware failure, so correcting the dose and using HE detergent normally clears it. Only if it persists with a correct dose and a foam-free drum is a sensor at fault.
How much detergent should I use in a Bosch washer?
Follow the dose line on the detergent for your load size and local water hardness, and use less for small or lightly soiled loads. Bosch machines use little water, so a top-loader-sized scoop will almost always over-foam and trip E33.
Related Bosch codes
- Bosch Washer E17 Bosch's E17 — shown as F17 or F29 on some models — means the washer couldn't draw water quickly enough to fill, almost always because the inlet-hose filter screen is clogged, the tap isn't fully open, or household water pressure is low.
- Bosch Washer E18 Bosch's E18 — the F18 display on some models — means the washer couldn't drain within the expected time, most often because the pump filter is clogged with lint and coins or the drain hose is kinked or pushed too far down the standpipe.
- Bosch Washer E23 Bosch's E23 — F23 on some displays — means the washer's AquaStop leak protection detected water in the base tray and cut the machine off to stop a flood, sometimes from a genuine leak but often from overfoaming, a hose weep, or a spill during a move.
- Bosch Washer E16 Bosch's E16 — displayed as E34, F16 or F34 on some models — means the door isn't locking, so the machine refuses to start, most often because a bit of laundry is caught in the seal or the door wasn't pushed until it clicked.
More: all Bosch washer codes · all Bosch codes · search by symptom