Bosch Dishwasher Error E27

⚡ Quick Answer: The Bosch dishwasher error E27 indicates an issue with the water inlet valve due to insufficient mains voltage, typically falling below 170–220V. This... ✅ DIY Fixable

What Does Error E27 Mean?

The Bosch dishwasher error E27 indicates an issue with the water inlet valve due to insufficient mains voltage, typically falling below 170–220V. This error often occurs during high household electrical demand, causing the dishwasher to stop shortly after starting. If you hear unusual sounds or the appliance fails to fill with water, it may be a sign of this voltage supply issue. To resolve it, ensure the dishwasher is connected to a dedicated outlet and consider running it during lower electrical load times.

Common Symptoms:

  • Dishwasher stops working shortly after start
  • Error E27 displayed on control panel
  • Occurs especially when household electrical load is high (e.g., evening)

Possible Causes

  • Mains voltage below required threshold (high)
  • Electrical network overload or fluctuations (medium)
  • Poor power connection such as use of power strips/extension cords (medium)

How to Fix Error E27

DIY Fix Check and improve power supply stability

  1. Ensure the dishwasher is connected to a dedicated electrical outlet directly (avoid power strips/extension cords).
  2. Try running the dishwasher when overall household electrical load is lower (e.g., delayed start).
  3. Observe if the error appears at specific times of day with high electrical demand.

Technician Only Measure and correct mains voltage supply

  1. Use a multimeter or voltage tester at the dishwasher outlet to measure voltage under load.
  2. Inspect household electrical distribution for voltage drops or loose connections.
  3. Consider installing a voltage stabilizer or dedicated circuit for the dishwasher.
  4. Coordinate with a licensed electrician to address any wiring or supply issues.

Parts needed: voltage stabilizer (optional)

🛑 When to Call a Pro:
  • If voltage to the appliance is within acceptable range yet E27 persists.
  • If there are signs of electrical burning, sparking, or panel damage around power connections.
  • If an electrician confirms household supply issues but cannot resolve them safely.

Next step

Choose the next step for E27

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Check during diagnosis

Most relevant component to inspect

Water Inlet Valve

Controls the flow of hot and cold water into the appliance.

Typical part-only price
$25 - $60
DIY difficulty
Easy
Estimated time
15-30 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Other parts options

Check related components first; use model search as a fallback.

Model number required

Model-compatible Dishwasher parts

Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.

Find a part that fits my model

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Optional routine care

Maintenance supplies

These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.

Maintenance supply

Dishwasher Cleaner and Descaler

Supports routine removal of mineral scale, grease, and odor. It is maintenance, not a repair for a failed pump, valve, or control.

View maintenance supply
Maintenance supply

Braided Dishwasher Inlet Hose

For replacement of an externally damaged supply hose. Verify connection size, length, and appliance installation requirements before ordering.

View maintenance supply

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.

Technical Specifications

wattage 20W
component Water Inlet Valve
resistance 1-2 ohms
part_number 00420092
voltage_rating 120V AC

Common Questions

What does E27 error mean on bosch dishwasher?

E27 indicates low mains voltage affecting the water inlet valve, causing the dishwasher to stop working.

Can I fix bosch dishwasher E27 error myself?

Yes, ensure the dishwasher is plugged into a dedicated outlet and try running it during lower electrical demand times.

How much does it cost to fix E27 error?

Repair costs range from ¥5,000 to ¥30,000+, depending on the complexity of the electrical work needed.

When should I call a technician for E27?

Call a technician if the error persists despite proper voltage supply or if there are signs of electrical damage.

Sources & References

Data last verified: 2026-07-25

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