66Fault clearance, repairTable 19 : Fault findingFault Cause Measure Expertrequired chapterFault at backflow stop £ control displays normal operationWastewater does not drainoff drainage objectsEmergency seal closed Open emergencyseal-- 4.5.3Operating seal closed Put operating sealin basic position bypressing button 1(acknowledgement)X 4.4.4Open operating sealmanually£ then carry outmaintenance as permaintenance plan--X4.5.68.4Backflow stop is blockedby a foreign bodyRemove foreignbody and carry outmaintenance as permaintenance planX 8.4No backflow detection bycontrolPressure hose not laidrising, condensation wateravoids transmission ofpressure changesLay pressure hoseproperlyX 6.4.4Check backflowdetection as perchapter 7.2.5;if required, replacecontrol-- 7.2.59.3Pressure hose defective Replace pressurehoseX 9.3Pressure sensor in controldefectiveReplace control 9.39.3 Repair, fault clearance and sparepartsFor repair works, fault clearance and spare parts ordering, please contact ACO Servicechapter 1.1, mentioning the original type plate data.
