Bosch Dishwasher Error Codes
If your Bosch dishwasher has just displayed an error code, don’t panic — understanding what it means can save you time, money, and stress. At London Appliance Repair, we’ve helped numerous homeowners across London diagnose and fix Bosch dishwasher issues quickly and reliably. In this guide, you’ll learn how Bosch error codes work, what the most common ones represent, and when it’s time to call in the experts.
How Bosch Dishwashers Display Error Codes
Bosch dishwashers typically show error codes in one of two ways: either via a digital display on the front panel or by flashing lights (for models without a full display). For instance, you might see something like “E24”, “E15”, “E09”, or “C6”. These codes indicate that the machine has detected a fault and entered a safe mode. Understanding them helps you decide whether you can attempt a quick fix (like clearing a filter) or need professional assistance.
Always start by switching off the dishwasher, unplugging it or switching off the circuit breaker, and ensuring the door is closed properly before diagnosing further.
Common Bosch Dishwasher Error Codes & What They Mean
Below are the most frequently encountered Bosch dishwasher error codes, along with likely causes and quick fixes you can try at home.
E01 / E02 / E03 – Control board / relay / heater module fault
- Cause: Fault in main control board, heater relay or heat‑pump motor circuit.
- Fix: Turn off power at breaker for ~30 seconds and switch back on. If error persists, a qualified technician may need to repair or replace the control board or modules.
E04 / E05 – Heater electronics / wash‑arm diverter fault
- Cause: Heater circuit failure, or the wash‑arm diverter circuit may be malfunctioning.
- Fix: Reset the appliance. If still showing error, technician check required—likely internal component or wiring issue.
E06 / E07 / E08 – Door sensor, Zeolite fan, loss of water fault
- Cause: Door lock/sensor not operating, Zeolite drying fan motor defect, or water level issue.
- Fix: Ensure door closes/locks correctly, inspect fan motor (on Zeolite drying models). If unsure, get technician help.
E09 / E10 / E11 – Heating fault / temperature sensor / thermistor issue
- Cause: Faulty heating element, internal heater, temperature sensor or thermistor.
- Fix: Try reset (power off ~1 min). If persists, check heating element resistance, sensor continuity. Replacement may be needed.
E12 – Limescale buildup in heat pump / slow heating
- Cause: Heavy limescale accumulation in heating system or heat‑pump models.
- Fix: Use a dishwasher descale suitable for Bosch models. Ensure use of water softening salt if required by model. Regular maintenance helps.
E13 – Water temperature too high
- Cause: Water inlet is too hot, sensor may be faulty.
- Fix: Check that incoming water is not excessively hot. Inspect temperature sensor/thermistor. Technician service if needed.
E14 – Flow meter / water inlet fault
- Cause: Flow meter or reed switch (on water inlet) not detecting correct water flow, blocked inlet or kinked hose.
- Fix: Check inlet hose for kinks, clean filter screen on hose/valve, ensure water supply turned on. If error remains, replace the flow meter.
E15 – Water leakage detected in base pan / flood sensor activated
- Cause: Water in the base pan—could be hose leak, spray‑arm crack, faulty valve or pan sensor triggered.
- Fix: Turn off water supply & power. Pull dishwasher out if needed, dry base pan thoroughly, inspect hoses, spray‑arms, gaskets. Once dry and safe, reset machine. If reoccurs, call technician.
E16 / E17 – Water inlet/filling fault (too much / unexpected water)
- Cause: Inlet valve stuck, hose kinked, float switch faulty.
- Fix: Check inlet hose and filters, ensure valve closes properly, inspect float assembly. Technician help likely needed.
E18 – Water supply fault / low water flow / blocked inlet
- Cause: Low water pressure, blocked inlet filter, valve issue.
- Fix: Check valve and hose filters, ensure tap fully open, confirm supply works (typical flow ~10 l/min or per manual). If supply OK, but code remains, technician.
E19 – Detergent dispenser solenoid or heat exchange fault
- Cause: Some models show E19 when detergent dispenser motor/solenoid or heat‑exchanger fault occurs.
- Fix: Inspect dispenser operation, replace if stuck. For heat exchanger fault, specialist service required.
E20 / E21 – Circulation pump blocked or heat pump internal heater fault
- Cause: Circulation pump impeller blocked, or internal heater of heat pump system malfunction.
- Fix: Check circulation paths, remove debris, test pump. If internal heater of heat‑pump design, professional repair necessary.
E22 – Filter blocked / debris in sump
- Cause: Filter at bottom of dishwasher clogged with food particles or foreign objects.
- Fix: Remove bottom rack, unscrew/remove filter housing, clean thoroughly under running water, reinstall. Run test cycle.
E23 – Drain pump circuit fault / drain pump blocked
- Cause: Drain pump electrical fault, or blockage in pump / impeller.
- Fix: Remove filter, inspect pump cover, remove debris, check impeller rotates. If motor doesn’t respond, technician required.
E24 / E25 – Drainage fault / water not draining properly
- Cause: Drain filter or hose blocked, pump cover loose, or drain hose connected incorrectly (e.g., with disposal plug).
- Fix: Clean drain hose and filter, ensure hose not kinked, remove plug if connected to garbage disposal, then reset cycle.
E27 – Low supply voltage / power issue
- Cause: Voltage supply too low or unstable.
- Fix: Confirm mains voltage at socket (should match model spec). If voltage okay but error persists, electrician needed.
C6 – Electrical fault / Circuit issue
- Cause: Electrical component malfunction or wiring problem.
- Fix: Power off the machine and reset. Persistent errors require a qualified technician.
PO – Power outage detected
- Cause: Sudden power cut during cycle.
- Fix: Restart the dishwasher and ensure power supply is stable.
-40 / Suc Code – Super Silence Mode error
- Cause: Internal sensor issue or programming fault.
- Fix: Reset the machine. If it reoccurs, professional diagnosis is needed.
H:XX Codes (e.g., H01, H24, H30) – Timer, delay start, or control board major fault
- Cause: Some H‑codes indicate time delay programming (H01 = 1-hour delay) or major board fault (H30 = control board issue) depending on model.
- Fix: For delay codes: cancel delay (press relevant buttons until h:00). For board faults: service required.
Tip: Before attempting any manual repair, always switch off the dishwasher at the mains and turn off the water supply. If the fault code persists after basic checks, or if you’re in doubt, use a qualified appliance engineer. Continuing to use the machine under fault conditions may lead to damage or risk.
When to Call a Professional Repair Service
If you’ve tried the quick fixes above and the error code returns, or if the dishwasher displays a code not listed here, it’s time to call in the experts. At London Appliance Repair, we cover all major brands including Bosch and provide fast call-outs across London.
Our skilled technicians use genuine spare parts and advanced diagnostic tools to ensure lasting repairs. Visit our dishwasher repair in London page for more details, or check our Bosch appliance repair section for brand-specific help.
Preventative Maintenance Tips
Follow these tips to keep your Bosch dishwasher running smoothly and avoid future error codes:
- Clean the filter, spray arms, and drain hose every few months.
- Use dishwasher salt and rinse aid to prevent limescale build-up.
- Run a maintenance wash at a high temperature once a month.
- Inspect hoses and connections regularly for leaks or damage.
- Ensure proper water pressure and clean the inlet valve.
- Keep the door seal clean and free of debris to prevent leaks.
- Always follow the user manual for model-specific maintenance guidance.
Need Expert Help in London?
If you’re dealing with a persistent Bosch dishwasher error, don’t delay. Book a professional service with our certified engineers today. We provide reliable, same-day dishwasher repair in London and guarantee every repair we complete. Call us or book.
Conclusion
Error codes on your Bosch dishwasher are your machine’s way of saying, “I need attention.” With a few basic checks, you can handle minor issues yourself. However, if the fault persists, getting professional help from London Appliance Repair is the best way to restore your appliance’s performance quickly and safely.