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Bosch Dishwasher Error Code E04

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 11, 2026
⚠ Medium Severity 🔧🔧 Moderate DIY

Water flow sensor fault — fill volume not being measured

The most common cause of the E04 error on a Bosch dishwasher is scale or debris jamming the flow sensor wheel (~45% of cases); start with: power-cycle first.

💰 DIY cost: $0–$40 👨‍🔧 Pro cost: $140–$280 Save $140+ by doing it yourself
Bosch Dishwasher error code E04 on the display panel
How the E04 code appears on a Bosch dishwasher display

What Does Error Code E04 Mean on a Bosch Dishwasher?

Water flow sensor fault — fill volume not being measured.

The control board expects a steady stream of pulses from the aquaflow meter's spinning paddle wheel as water enters the tub. When those pulses stop, drop out, or read implausibly during fill, the board can't verify how much water it's taking on and posts E04, aborting or filling erratically to avoid over- or under-filling. Unlike E15 (leak/anti-flood float) or E24 (drain/blockage), E04 points specifically at the fill-metering sensor path — scale-jammed wheel, failed sensor, or a bad connector.

Models affected: Bosch dishwashers across most current tub platforms that use an aquaflow-style flow meter to measure fill volume; known examples include SHEM63W55N, SHPM65Z55N, SHXM4AY55N, SHEM3AY55N, SHP878ZD5N, and SHX878ZD5N.
What owners report: Owners commonly report this appearing mid-fill, sometimes after a period of low household water pressure or in hard-water areas where scale builds on the paddle wheel. A power-cycle and cleaning the inlet screen often clears a one-off glitch; if it returns, the sensor or its connector is the usual culprit.

What Causes Error Code E04?

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

  1. 1
    Scale or debris jamming the flow sensor wheel 45% of cases
  2. 2
    Flow sensor failure 30% of cases
  3. 3
    Harness/connector fault to the sensor 25% of cases

How to Fix Bosch Dishwasher Error Code E04

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

    Power-cycle first

    Switch the unit off, wait 60 seconds, and rerun — transient sensor glitches clear with a reset.

  2. 2

    Check the supply path

    Confirm good water pressure and clean the inlet screen — weak flow reads like a sensor fault.

  3. 3

    Replace the flow sensor

    The sensor sits on the side of the unit near the inlet (accessed by removing the side or base panel). It's an inexpensive part but tight to reach.

    🔩 Bosch flow sensor ($15–$40)
    ⚠️ Switch off the breaker and water supply before opening panels.

How to Reset Error Code E04

Switch off at the unit or breaker for 60 seconds, restore power, and start a fresh program.

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

Full Bosch dishwasher reset guide → Enter diagnostic mode →

Did this guide fix your appliance?

When to Call a Professional

Reaching the flow sensor requires partial disassembly on most models — if you're not comfortable opening the side panel, this one's a fair technician call.

Average professional repair cost for this issue: $140–$280

Related Error Codes

E15
Leak protection activated — water detected in base tray
⚠ High Severity
E24
Drain blocked — dishwasher not draining
⚠ High Severity
E01
Heating element or NTC sensor failure — water not heating
⚠ High Severity

Find Replacement Parts

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

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

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

More Bosch Dishwasher Error Codes

E25 Drain pump or filter blocked — drain impeller obstructed E09 Heating circuit failure — heater not functioning E05 Water shortage — insufficient water entering dishwasher E22 Residual water in the sump — filter or impeller area blocked

Frequently Asked Questions

Can I keep using my Bosch Dishwasher when error E04 appears? +
You often can for a cycle or two, but the sensor issue behind E04 will keep interrupting normal operation until it is fixed. Plan the repair rather than ignoring the code.
What most commonly causes E04 on a Bosch Dishwasher? +
Across reported Bosch dishwasher repairs, the most frequent is scale or debris jamming the flow sensor wheel (45% of cases), flow sensor failure (30%), then harness/connector fault to the sensor (25%). Check them in that order before replacing any parts.
E04 keeps coming back after a reset — what should I check next? +
A reset only clears the stored E04 fault; if it returns, the sensor problem is still present. Move on to the physical checks — power-cycle first, then check the supply path — 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 Dishwasher error E04? +
A DIY repair typically runs $0–$40 in parts, versus $140–$280 for a professional service call, so handling it yourself saves around $140. Expect the work to take roughly 30–60 minutes.
Which Bosch Dishwasher models show error E04? +
E04 is documented on Bosch dishwashers across most current tub platforms that use an aquaflow-style flow meter to measure fill volume; known examples include SHEM63W55N, SHPM65Z55N, SHXM4AY55N, SHEM3AY55N, SHP878ZD5N, and SHX878ZD5N.. 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: June 11, 2026.

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