The Zanussi ZRB634FS 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 lamp in the appliance is defective.
The appliance might be switched off or not connected properly.
Noises may occur due to normal appliance operations.
The temperature regulator may be set incorrectly.
The temperature regulator may be set incorrectly.
The melting water outlet does not flow into the evaporative tray above the compressor.
The temperature regulator may be set incorrectly.