132Service Manual – SC401, SCRUBTEC 34430 - Solution SystemTroubleshootingTrouble Possible Causes RemedySmall amount of solution or nosolution reaches the brushThe solution filter is clogged/dirty Clean the filterSolution supply valve locked in (semi) closedpositionReplace the valveSolenoid valve (EV1) broken or electricalconnection interruptedReplace the solenoidvalve/repair the electricalconnectionPresence of debris in water tank blocking theoutlet holeClean the tankPresence of debris in the detergent solutionhose, blocking the passage of the liquidClean the hosesThe solution reaches the brushalso when the machine is offPresence of dirt or scale in solenoid valve(EV1)Clean the solenoid valveSolenoid valve (EV1) broken Replace the solenoid valveThe Detergent system is notreaching the brush, or is notarriving in sufficient quantityThe hydraulic circuit upstream of thedetergent pump is not triggeredCheck if the hose is filledand, if necessary, performone or more draining cyclesThe pump (M4) is broken or there is an openin the electrical connectionReplace the pump/repair theelectrical connectionThere is foreign material/debris in thedetergent bottle clogging the output holeClean the bottleThere is debris in the detergent hosesclogging the detergent flowClean the hoses
