Bosch Dishwasher Error Code E27 — Low Voltage Detected
What this means
The E27 error indicates the dishwasher is receiving voltage below its operating requirements. This can be caused by brownout conditions, an overloaded electrical circuit, a loose outlet connection, or a damaged power cord. The dishwasher requires a stable 120V supply to operate correctly.
Step-by-step fix
3 stepsCheck the electrical outlet
Use a voltage tester or multimeter to measure the voltage at the outlet. It should read between 110V–125V.
If voltage is below 110V, the issue is with your home electrical supply, not the dishwasher.
Check the circuit
Make sure the dishwasher is on a dedicated circuit. No other high-draw appliance (like a garbage disposal) should be on the same breaker.
Running the microwave or disposal while the dishwasher is on can cause voltage drops.
Inspect the power cord
Check the power cord for damage, and ensure the outlet connection is tight and not corroded.
A loose plug in the outlet can cause intermittent voltage drops.
When to call a professional
If your home voltage is consistently low, contact an electrician to evaluate your electrical panel and wiring.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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