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Incorrect voltage

Display shows 'Incorrect voltage' — Power supply problem

Siemens · EQ900 TQ900 Coffee Machines

What does Incorrect voltage mean?

The appliance display indicates an 'Incorrect voltage' error, signifying a problem with the electrical power supply to the Siemens EQ900 TQ900 Coffee Machine.

Common Causes

  • Appliance connected to an incorrect voltage
  • Problems with the household power supply

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the appliance is only operated within the specified voltage range of 220 - 240 V.

  2. 2

    Check the power outlet the appliance is connected to for stable voltage.

  3. 3

    If using an extension cord, try plugging the appliance directly into a wall outlet, or consult an electrician if the problem persists.

Browse all codes in this manual (27)
Verified technical data. Last updated: April 2026

Related Faults

Appliance unresponsiveAppliance no longer responds — Appliance has a faultBrewing unit jammedBrewing unit cannot be removed — Locking device jammedCoffee grounds wet/not compactCoffee grounds are not compact and are too wet — Grinding or bean issue
Source: Siemens EQ900 TQ900 Coffee Machines
Open Manual (Page 67)Search more codes in this manual