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Display shows 'Overvoltage or undervoltage'

Display shows 'Overvoltage or undervoltage' — Power supply problems

Siemens · Fully Automatic Espresso Machines

What does Display shows 'Overvoltage or undervoltage' mean?

The display indicates an overvoltage or undervoltage condition, meaning there are problems with the electrical power supply to the appliance.

Common Causes

  • Problems with the power supply
  • Voltage outside the specified range (220-240 V)

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Only operate the appliance at the specified 220-240 V.

  2. 2

    Check your household's electrical supply for stability.

  3. 3

    Try plugging the appliance into a different power outlet.

Browse all codes in this manual (26)
Verified technical data. Last updated: April 2026

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Source: Siemens Fully Automatic Espresso Machines
Open Manual (Page 32)Search more codes in this manual