Vaillant VR 66 Installation Instructions Manual

Contents

- 14 -0020140122_02 - 05/13MAINTENANCEEN6 User informationAt the end of the installation, the installer must:- explain the operation of the appliance and its safety devices tothe user, if necessary provide a demonstration and answer anyquestions;- give the user all the required documentation,- fill in the documents where necessary;- advise the user of the precautions necessary to preventdamage to the system, appliance and the building;- remind the user to service the appliance annually.7 Maintenance7.1 Trouble-shooting7.1.1 Fault diagnosisThe following checks should be performed before proceedingonto specifi c diagnostics:- Ensure that the control unit has not been disconnected fromthe electricity supply and that it is connected correctly.- Ensure that all installation’s appliances are available.- Check the functioning of external regulatory devices (roomthermostat(s).i The rectification of faults described in this chaptershould be carried out by a qualified engineer and ifneeded by the After Sales Service.230V~ CYL.2 1DHWCH1 CH2ON DHW OFF12-+BUS NTC21 3Key1 Fuse2 Green LED, power supply3 Red LED flashes, faultFault Possible cause SolutionGreen LEDpermanently offNo 230 V power supplyor the fuse in theappliance is faultyCheck that the mainvoltage cable isconnected correctly.Check the domesticfuse for the 230 Vsupply and re-connectthe power supply.Replace the mainsupply fuse in thecontrol unit (seetechnical data).Red LED flashesquickly (2 Hz, 2flashes/second)Short circuit ofthe connectedtemperature sensor(NTC) in the cylinderCheck the cable of thetemperature sensor(NTC) for damage.Replace thetemperature sensor(NTC) in the cylinder.Red LED flashesslowly (0,5 Hz, 1flashes/ 2 seconds)Communications errorwith the eBUS boiler.Check that theboiler's eBUS cable isconnected correctlyand not damagedCheck that the boileris turned onHeating zone valvesnot operatingValve disconnected.Valve doesn't open.Check the roomthermostat(s)compatibility andconnections.Check the valveconnections.Check the roomthermostat(s) pairing.Ensure that there isno interruption to theelectricity supply andthat the unit controlis properly connectedand turned on.DHW valve notoperatingFault domestic hotwater cylinderCylinder dualthermostatdisconnected.The temperaturesensor is defective ordisconnected.Check the cylinderdual thermostatand temperatureconnections.Check the sensor’sresistance.Ensure that there isno interruption to theelectricity supply andthat the control unitis properly connectedand turned on.7.2 Main supply cablee Danger!• The main supply cable must be replaced by aqualified and competent electrician.∙ If the main supply cable is damaged, replace it refering to thechapter "Electrical connection".