The Zanussi ZU 7155 Refrigerator has some known problems that occur often. Here are some easy to do solutions for the problems or error codes your Zanussi might be giving you.
The appliance is not receiving power. This could be due to a power outage or an issue with the electrical socket.
The interior light bulb might be faulty or not properly installed.
The appliance is not cooling efficiently which could be due to incorrect thermostat settings or external temperature conditions.
The compressor is running non-stop which might indicate a problem with the cooling system or temperature settings.
There is a build-up of frost and ice in the freezer compartment.
Unusual or loud noises are emanating from the appliance.
Water accumulation is present under the salad bin.