Vaillant VEN 5/5 U classic Installation And Operating Instructions Manual

6 Maintenance and repair346 Maintenance and repair6.1 MaintenanceVaillant VEN electric storage water heaters are designedto require virtually no maintenance. All internalcomponents are protected from external influences. It issufficient just to wipe down the VEN unit occasionallywith a damp cloth – with a little water and milddetergent if required. The appliance should be servicedevery three years. This procedure must only be carriedout by an authorised service installer. Note that morefrequent servicing (descaling) may be required if theappliance is used in a hard-water area.Danger!Electrical hazard: the appliance must alwaysbe disconnected from the mains power supplybefore repairs or servicing are carried out.6.2 InspectionsFurring can occur with water of certain types and withcertain water temperatures and levels of consumption.In the case of open appliances, this can lead to anincrease in pressure and – in extreme circumstances – toirreparable damage to the appliance. Regular inspectionand descaling will prevent this happening. If the waterflow-rate drops noticeably, have the power-supply andwater-inlet components examined – and the VEN unitdescaled – by an authorised service installer.6.3 TroubleshootingIn the event of a fault occurring, disconnect the VENunit immediately by unplugging it from the mains powersupply. Have the fault rectified by an authorised serviceinstaller only.6.4 Spare partsPlease refer to our current catalogue for further detailsof any spares that you may require.Information is also available from members of ourdealer network and our direct Customer ServiceDepartment.The power connection lead must only be exchanged fora new Vaillant-supplied replacement.Spare-part no.:255 784 for VEN classic and VEN exclusivVEN 5/5 classic; VEN 5/5 exclusiv