Troubleshooting - Kärcher HDS 5/11 U Service Manual

8

Troubleshooting

Fault
Unit does not work
Device is not building up pres-
sure
Device continuously turns on
and off while hand spray gun is
open
Appliance continuously turns on
and off while hand spray gun is
closed
Appliance leaks, water drips
from the bottom of the appli-
ance.
Appliance is leaking oil
Device is not sucking in deter-
gent
Burner does not start
46
English 5.906-487.0 Rev. 00 (04/10)
Remedial action
No mains power. Check the mains connection.
–
Check/replace the appliance switch.
–
Overflow valve / pressure switch stuck - check, grease, replace.
–
Motor overloaded, overheated; switch off the appliance to "0/OFF" and
–
let it cool down; switch appliance on.
The exhaust temperature limiter has been triggered, the heating coil is
–
full of soot and exhaust temperature is too high.
Press reset button of the exhaust temperature limiter.
Remove the soot from the heating coil and readjust the burner if nec-
essary.
Air within the system, ventilate pump.
–
With open hand spray gun turn device on and off multiple times with the
device switch.
Note for appliances without hose drum:
By dismantling the high pressure hose from the high pressure connec-
tion the venting process is accelerated.
Fill/replace external detergent container if empty.
Check connections and conduits.
Filter in the water connection is dirty, clean filter.
–
Water supply volume too low, check water supply volume (refer to
–
Specifications).
Tap closed, open tap.
–
High pressure nozzles worn, replace.
–
High pressure nozzle plugged, clean nozzle.
–
Heating coil calcified, decalcify appliance.
–
Leak in the high pressure system; check the high pressure system and
–
connections for leaks.
Pressure holding valve in the cylinder head leaks; check.
–
Pump leaks, safety valve not tight.
–
Note: 3 drops/minute are allowed.
High pressure seals leak; replace.
–
Appliance is losing oil between the cylinder head and the piston casing;
–
replace the oil seals.
Nozzle set to "High pressure"; set the nozzle to "CHEM".
–
The external detergent container is empty; fill/replace external deter-
–
gent container.
The filter at the detergent suction hose is dirty; clean filter.
–
Dosing on filter is closed; open dosing.
–
The backflow valve is plugged; remove the detergent hose and loosen
–
the backflow valve using a blunt object.
Injector dirty or worn; replace injector.
–
Fuel tank empty; fill fuel.
–
Fuel filter dirty; change fuel filter.
–
Fuel valve is not opening; check, replace.
–
Fuel pump does not feed any fuel; check, replace the fuel pump and
–
the drive parts.
Lack of water; check water connection/supply lines.
–
Ignition electrodes are dirty or worn; clean or replace the ignition elec-
–
trodes.
Ignition electrodes are set incorrectly; check, correct the ignition geom-
–
etry of the ignition electrodes and the fuel nozzle.
Ignition transformer defective; check.
–