System Telephones on the OpenCom 100 / Aastra 800 Using Your Telephone8Dealing with MalfunctionsPlease refer to the chapter entitled “Frequently Asked Questions” in the “Mountingand Commissioning” user guide for tips on how you can deal with any faults youmay experience with your telephone.1.1 Using Your Telephone1.1.1 Safety PrecautionsThe CE symbol on the product confirms that it meets the European guidelines onuser safety and electromagnetic compatibility valid at the time of authorisation.WARNING! Do not open the telephone or the connected accessories,as this could lead to you touching live parts.Note: Repairs must only be carried out by authorised pers-onnel.■ Keep fluids and chemicals away from the telephone and its accessories.■ Use only the AC adapter plug included in the delivery (if necessary).■ Do not use AC adapter plugs that show visible damage (e.g. cracks in thehousing).1.1.2 Installation SiteDo not install the telephone or its accessories■ near water, moisture or in damp locations;■ near sources of heat or in direct sunlight;■ in unventilated rooms;■ near devices that generate strong magnetic fields, electrical devices, fluo-rescent lamps, computers, radios or television sets;