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Bosch Washing Machine Error Code F03

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: July 19, 2026
⚠ High Severity 🔧🔧 Moderate DIY Also shown as: E03

Drain timeout — water did not drain within the expected time

The most common cause of the F03 error on a Bosch washing machine is drain pump filter clogged (~45% of cases); start with: clean the drain pump filter.

💰 DIY cost: $0–$100 👨‍🔧 Pro cost: $150–$280 Save $150+ by doing it yourself
Bosch Washing Machine error code F03 on the display panel
How the F03 code appears on a Bosch washing machine display

What Does Error Code F03 Mean on a Bosch Washing Machine?

Drain timeout — water did not drain within the expected time.

F03 (also shown as E03) fires when the control board monitors the drain phase and detects that the water level has not dropped enough within roughly a 10-minute drain window. The board infers a flow restriction rather than a sensor fault, so it halts the cycle to avoid running the pump dry. Unlike fill or pressure-sensor codes (E04) or the leak/aquastop family (E18/F18), F03 points specifically at obstructed or failed drainage: a clogged filter, kinked hose, blocked standpipe, or a stalled pump impeller.

Models affected: Bosch front-load washers across the WFB range, including compact models such as the WAT28400UC and WGA12400UC
What owners report: Owners commonly report F03 appearing mid-cycle with standing water left in the drum, often after coins, lint, or a stray sock reach the pump filter. Many say a simple filter clean-out at the lower front panel clears it, so that is worth trying before assuming a failed pump; a partially kinked drain hose behind the machine is another frequent, easily missed trigger.

What Causes Error Code F03?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

  1. 1
    Drain pump filter clogged 45% of cases
  2. 2
    Drain hose kinked or standpipe blocked 30% of cases
  3. 3
    Drain pump impeller blocked by debris 15% of cases
  4. 4
    Drain pump motor failed 10% of cases

How to Fix Bosch Washing Machine Error Code F03

🔧🔧 Moderate DIY Est. time: 30–60 min
⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.
  1. 1

    Clean the drain pump filter

    Access the filter at the lower front of the machine; turn slowly to drain water, then remove and clean.

    ⚠️ Have towels ready — water will drain out.
  2. 2

    Inspect the drain hose

    Check for kinks from the back of the machine to the standpipe.

  3. 3

    Clear the standpipe

    Pour water directly into the standpipe to check for a blocked household drain.

  4. 4

    Test the drain pump

    If the filter and hose are clear, test the pump motor.

    🔩 Bosch drain pump ($50–$100)

How to Reset Error Code F03

Clear the drain filter, confirm the hose path, then press Pause/Cancel and restart.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

Full Bosch washer reset guide → Enter diagnostic mode → Symptom guide: Washer won't drain →

Did this guide fix your appliance?

When to Call a Professional

If filter and hose are clear and F03 persists, replace the drain pump.

Average professional repair cost for this issue: $150–$280

Related Error Codes

E18
Drain time exceeded — water not draining within expected time
⚠ High Severity
E18
Drain time exceeded — water not draining within expected time
⚠ High Severity
E04
Anti-flood device activated — water detected in base
⚠ High Severity

Find Replacement Parts

Use these links to find the exact replacement parts for your Bosch Washing Machine:

🔩
Search PartSelect
Bosch Washing Machine repair parts
🔧
Search RepairClinic
Step-by-step video guides

External links — ApplianceErrors.com is not affiliated with these retailers.

More Bosch Washing Machine Error Codes

E02 Door lock failure — cannot lock door for cycle E17 Water intake fault — fill time exceeded F01 Water intake timeout — machine failed to fill within the expected time F02 Heating timeout — water did not reach the target temperature F04 Motor fault — drive motor not running correctly F16 Door not closed — door not shut or door lock not engaging

Frequently Asked Questions

Can I keep using my Bosch Washing Machine when error F03 appears? +
It is not advisable. The washing machine may still power on, but running it while F03 is active can worsen the drainage fault or damage related parts. Treat it as a soon-as-possible repair.
What most commonly causes F03 on a Bosch Washing Machine? +
Across reported Bosch washing machine repairs, the most frequent is drain pump filter clogged (45% of cases), drain hose kinked or standpipe blocked (30%), then drain pump impeller blocked by debris (15%). Check them in that order before replacing any parts.
F03 keeps coming back after a reset — what should I check next? +
A reset only clears the stored F03 fault; if it returns, the drainage problem is still present. Move on to the physical checks — clean the drain pump filter, then inspect the drain hose — since the code will reappear until the root cause is resolved. This is a moderate job — a multimeter and some disassembly are usually involved.
How much does it cost to fix Bosch Washing Machine error F03? +
A DIY repair typically runs $0–$100 in parts, versus $150–$280 for a professional service call, so handling it yourself saves around $150. Expect the work to take roughly 30–60 minutes.
Which Bosch Washing Machine models show error F03? +
F03 is documented on Bosch front-load washers across the WFB range, including compact models such as the WAT28400UC and WGA12400UC. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

Content verified against manufacturer service documentation. Last verified: July 19, 2026.

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