116 of 188MAINTENANCE AND USE MANUALfurnace DEENCH. 8MAINTENANCEPag. 142 8.1 CleaningPag. 142 8.2 Routine maintenancePag. 143 8.3 Unscheduled maintenancePag. 143 8.4 Restarting after a long period of inactivityPag. 143 8.5 Requesting technical assistanceCH. 9TROUBLESHOOTINGPag. 144 9.1 WarningPag. 144 9.2 Problems, causes and remediesAPPENDICESPag. 147 A.1 CE Declaration of conformityPag. 148 A.2 Warranty certificate and identification formPag. 149 A.3 Maintenance and repair worksheetPag. 150 A.4 Authorized service partnersPag. 150 A.5 NotesThe data given in this manual may be modified without prior notice.CH. 7USING THE EQUIPMENTPag. 136 7.1 WarningPag. 136 7.2 Safety systemPag. 137 7.2.1 Maximum temperature increase ratePag. 137 7.3 Data programmingPag. 138 7.3.1 Immediate startPag. 139 7.3.2 Delayed startPag. 139 7.4 Correcting dataPag. 140 7.5 Operating startPag. 140 7.6 Checks during workPag. 141 7.7 No electrical powerPag. 141 7.8 Residual risk