6Unplug the appliance before carrying out anymaintenance operation.Periodic clearingClean the inside with warm water and bicarbonate ofsoda. Clean the outside with a silicone wax spray.Clean the condenser and compressor with a brushor vacuum cleaner.This will improve performance and consequentlysave on electricity.Periods of non-useIf you are not using the appliance for any length oftime, the following precautions should be taken:unplug the appliance;take all food out;defrost and clean the inside and all the accessories;leave the door ajar so that air can circulate inside inorder to prevent unpleasant smells forming.The light bulbThe opening on the diffuser gives access to the lightbulb.If the light does not come on when the door isopened, check that the bulb is screwed in properly;replace the bulb if the fault persists.The rating is shown on the light bulb cover.MaintenanceCustomer service and spare partsIf the appliance is not functioning properly, checkthat:the plug is firmly in the wall socket and the mainspower switch is on;there is an electricity supply (find out by plugging inanother appliance);the thermostat knob is in the correct position.Also check the following:If the appliance is very noisy, check that the sidesare not vibrating against adjacent kitchen units andthat the refrigeration unit pipes are not vibrating.If your appliance is still not working properly aftermaking the above checks, contact the nearestservice centre.To obtain fast service, it is essential that whenyou apply for it you specify the model and serialnumber of your appliance which can be found onthe guarantee certificate or on the rating platelocated inside the appliance, on the bottom left-hand side.