Guide · Faults

Thermomix® won’t switch on

The display stays black and nothing responds? Before you assume a fault, check the power, the plug and the fuse box.

For the TM5 and TM6 · Mixklinik workshop · Updated November 2026

In short

It is usually the power supply: the socket, a multi-socket adapter or a loose plug. Check that first. If the fuse or the residual current device (RCD) trips when you switch on, don’t switch the machine on again and have it checked.

What you can check yourself

  1. Test the socket. Plug another appliance into the same socket. If it doesn’t work either, the problem is the socket or the fuse.
  2. Plug in directly. Vorwerk advises against extension leads. Plug the Thermomix® straight into the wall socket, without a multi-socket adapter.
  3. Check the cable. Is the plug pushed in properly? If the cable is kinked, crushed or damaged, stop using the machine.
  4. Cut the power briefly. Unplug, wait a minute, plug back in and switch the machine on.
  5. Watch for messages. If a number appears on the display, look it up in the error code list.

What’s normal

  • The Thermomix® switches itself off after a while without use. That’s an energy-saving feature, not a fault.
  • If the plug was pulled while cooking, the machine reports a power interruption the next time it starts (C151). Always switch the machine off with the switch, not by unplugging it.
  • On the TM6, a software update can take a moment. Leave the machine plugged in while it runs.

When not to switch it on again

Don’t switch it on again if the fuse or RCD trips when you switch on, if liquid has got into the machine, if it smells burnt or if the cable is damaged. Unplug it and have it checked.

If the display stays dark even though the socket works, the fault is usually in the power supply or the electronics. Don’t open the machine yourself: there are 230 volts inside, and some components can stay live even after unplugging. Vorwerk recommends leaving electrical repairs to specialists using original parts.

The machine runs but the display stays dark

If you can hear the motor or feel warmth but the display shows nothing, the problem is more likely the display or its control board. That’s also a job for the workshop.

Sources

Mixklinik is an independent workshop and is not affiliated with Vorwerk. Thermomix®, Cookidoo®, Varoma® and Cook-Key® are trademarks of the Vorwerk Group. Information given in good faith; your machine’s user manual takes precedence.