Kärcher HDS 3.9/20 Ea Cage Operator's Manual

Also see for HDS 3.5/30 Ea Cage: Operator's manual Operating instructions Manual Operator's manual

HDS 505, 508, 509, 510 • 9.800-078.0 - NPRESSURE WASHER Troubleshooting Guide14TROUBLESHOOTINGPROBLEM POSSIBLE CAUSE SOLUTIONLOW WATERTEMPERATUREImproper fuel or water in fuel Drain fuel tank and replace with proper fuel.Low fuel pressure Increase fuel pressure.Weak fuel pump Check fuel pump temperature. Replacepump if needed.Fuel fi lter partially clogged Replace as needed.Soot build up on coils Clean coils with soot remover.Lime build up on coils Clean inside of coils using coil cleaner.Improper burner nozzle See Burner Specifications.WATERTEMPERATURETOO HOTIncoming water to machinewarm or hotLower incoming water temperature.Fuel pump pressure too high Lower fuel pressure.Fuel pump defective Replace fuel pump.Detergent line sucking air Tighten all clamps. Check detergent line for holes.Defective high limit switch(thermostat)Replace.Incorrect fuel nozzle size See Burner Specifications.Insuffi cient water supplied Check GPM to machine.Restricted water flow Check nozzle for obstruction, proper size.MACHINESMOKESWHILEBURNER UNITIS RUNNINGORUNIT SMOKESAT COLD-STARTONLY WHENBURNERIS OFFImproper air adjustment Readjust air bands on burner assemblyFuel pressure is low <140 psi forburnerAdjust fuel pump pressure to specificationsBurner nozzle is plugged or dirty Replace nozzle. Check parts breakdownfor nozzle sizeBurner nozzle spray pattern isfaultyReplace nozzle. Check parts breakdownfor nozzle sizeHeavy accumulation of soot oncoils and burner assemblyRemove coils and burner assembly,clean thoroughly Call local dealerMisaligned electrode setting Realign electrodes to specificationsObstruction in smoke stack Check for insulation blockage or otherforeign objectsLow engine RPM Increase RPM to correct specs. See serial plateFuel Pressure is too high forclean burn (fuel PSI above 140and below 200) and smokeswhen burner is offReduce fuel pressure PSI/Increase air band set forcleaner without max water heat loss