Not connected.
The circuit breaker has tripped or the fuse has blown.

The temperature control is set too high.
Set the temperature control lower and wait a few hours for the temperature to stabilize.
The door is left open too long or opened too often, causing hot air to enter the unit.
The door is not closed properly.
The door gasket does not seal properly.
The appliance was recently disconnected from the mains; it will take at least four hours for it to return to temperature.

The temperature controls are set too low.
Set the temperature controls to a higher setting and wait a few hours for the temperature to stabilize.

Make sure the unit is on a level surface.
The unit is against the back wall.
Move the unit and make sure it is no longer against the wall.
If the vibration persists, turn off the device and unplug it. Then contact customer service for assistance.

The door is ajar.
The door stays open too long or is opened too often.
Open the door less frequently.
The door does not close properly.

The door is ajar, allowing cold air from the unit to come into contact with warm, moist air from outside.