67G.14 Other surfaces• Clean external glass, metal and plastic parts only with non-aggressive detergents. Stop immediately using those prod-ucts if detecting any visual or tactile characteristic change onsurfaces and thoroughly rinse with water (examples: glassbecoming mat/scratched/other, or plastic discoloring/melting/other, or metal showing rust/stains/scratches). Carefully dryafter rinsing.IMPORTANTAs for the plastic handle, do not use detergentscontaining sodium hypochlorite.• Clean the stainless steel parts every day using lukewarmneutral soapy water;Rinse with plenty of water and dry thoroughly.• Do not clean the stainless steel with steel wool, brushes orscrapers in common steel, as they could deposit ferrousparticles which oxidize, causing rust spots;G.15 Periods of non-useIf the appliance is not going to be used for some time, take thefollowing precautions:• close the water supply tap(s), if present;• close the gas valves;• disconnect the power supply or remove the plug from thepower socket, if present;• clean the cabinet, going over all the stainless steel surfacesvigorously with a rag moistened with paraffin oil to create aprotective film;• periodically air the premises.IMPORTANTThe warranty does not cover any damages caused byice formations in the appliance pipes.G.16 Boiler maintenanceIn case of excessive scale in the boiler the display signals theneed to carry out descaling.• For boiler descaling see F.16.2 BOILER DESCALINGparagraph.IMPORTANTThe manufacturer declines any liability if theseprescriptions are not respected;Also, the warranty does not cover the repair orreplacement of components damaged by scale when-ever the required supply water characteristics are notrespected.G.17 Replacing wear and tear componentsThere are parts, whose damage happens because of theordinary use during a period, which are not covered by themanufacturer warranty.G.18 Repair and extraordinary maintenanceNOTE!Repair and extraordinary maintenance have to becarried out by specialised authorised personnel, whocan ask the manufacturer to supply a servicingmanual.G.19 Maintenance intervalsIt is advisable to carry out the checks with the frequency given in the following table:Maintenance, inspections, checks and cleaning Frequency ResponsabilityOrdinary cleaning• general cleaning of appliance and surroundingarea• Daily • OperatorMechanical protection devices• check their condition and for any deformation,loosening or removed parts• Every 6 months • ServiceControl• check the mechanical parts, for cracks or defor-mations, tightening of screws: check thereadability and condition of words, stickers andsymbols and restore if necessary• Yearly • ServiceAppliance structure• tightening of main bolts (screws, fixing systems,etc.) of appliance• Yearly • ServiceSafety signs• check the readability and condition of safetysigns• Yearly • Service