Troubleshooting - Kärcher HDS Middle series Service Manual

HDS Middle Range / HDS Premium Range

5 Troubleshooting

Fault
Unit is not running (no LED
display)
Motor thermal contact has
actuated
Water pressure too low
Water is not heated
Indicator LED is lit
Insufficient or no cleaning
agent function
Pressure drop in the high-
pressure system
Service Manual 04.2008
Measure
– Check/replace mains voltage, connection cable and mains
fuse.
– Check fuse (F1).
– Check/replace unit switch.
– Check/replace the pressure switch.
– Check/adjust/replace control circuit transformer.
– Check/replace the thermal fuse.
– Check/replace printed circuit board and soft start.
– Check/replace contactor (K1).
– Switch off unit and leave to cool. Correct fault and switch unit
back on again.
– Check/increase water supply volume.
– Check/clean/replace water fine filter.
– Vent the unit.
– Check /replace high-pressure nozzle.
– Check pressure and suction valves for leaks/replace.
– Check/adjust/replace overflow valve.
– Check/adjust/replace safety valve.
– Check/correct temperature setting.
– Ensure adequate water supply when low-water protection is
switched off/repair low-water protection.
– Check/top-up fuel level in the tank.
– Check/replace fuel pump solenoid valve.
– Check/clean/replace fuel filter.
– Check/correct fuel pump setting.
– Check/replace the fuel nozzle.
– Check/replace ignition cable.
– Check/correct ignition electrode spacings.
– Check/repair burner fan.
– Check/correct air flap setting.
– See Chapter 3.1
– Check/correct metering valve setting.
– Check/top up cleaning agent tank.
– Check/clean/replace cleaning agent filter.
– Check/replace cleaning agent suction hose, metering valve
and cleaning agent suction at the cylinder head.
– Check handgun and O-rings on high-pressure hose for leaks/
replace.
– Check non-return valve for leaks/replace O-rings.
– Check/adjust/replace overflow valve.
– Check/replace the pressure switch and control piston.
Troubleshooting
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