Manual for GU21N..

Manual for GU21N..

Brand: SIEMENS

Category: Refrigeration

Document Type: Manual

Language: EN

Uploaded: Nov. 21, 2025, 7:55 p.m.

Warranty Information

The manufacturer's warranty for private consumers in the European Economic Area is 2 years.

Switching on the appliance:

  1. Electrically connect the appliance.
  2. Press and hold for three seconds.
  3. The temperature display shows an animation and the control panel is locked.
  4. The appliance is ready to use once the animation has ended and an LED lights up for the temperature display.
  5. The appliance begins to cool.
  6. Switch off the warning tone using >.
  7. Set the required temperature.

Switching off the appliance:

Press and hold for 3 seconds.

Troubleshooting and error codes

Fault Cause and troubleshooting
The appliance is not cooling, the displays and lighting are lit. Showroom mode is switched on.
  1. Disconnect the appliance from the mains.
  2. Wait 2 minutes.
  3. Reconnect the appliance.
  4. Press and hold > until 4 audible signals have sounded.
  5. After a short time, check whether your appliance is cooling.
Home Connect is not working properly. Different causes are possible.
Go to www.home-connect.com.
The warning tone sounds.
The door alarm is switched on.		 The appliance door is open.
Close the appliance door.
A warning tone sounds and the temperature display flashes. Different causes are possible.
Press >.
The alarm is switched off.
The exterior ventilation grilles are blocked.
Remove any obstructions from in front of the exterior ventilation grilles.
The temperature alarm is switched on. Larger quantities of fresh food have been put in.
Do not exceed the max. freezing capacity.
The temperature differs greatly from the setting. Different causes are possible.
  1. Switch off the appliance.
  2. Switch the appliance back on after five minutes.
  3. If the temperature is too warm, check the temperature again after a couple of hours.
  4. If the temperature is too cold, check the temperature again on the following day.
The appliance hums, bubbles, buzzes, gargles, clicks or crackles. Not a fault. A motor is running, e.g. refrigerating unit, fan. Refrigerant flows through the pipes. The motor, switches or solenoid valves are switching on or off. Automatic defrosting is running.
No action required.
The appliance makes noises. Fittings wobble or stick.
Check the removable fittings and, if required, replace these.
Containers are touching.
Move the containers apart.
Super freezing is switched on.
No action required.
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