Troubleshooting - Kärcher HD 10/25 S Service Manual

8

Troubleshooting

Findings
Appliance is not running
Appliance is not building up pressure
Device turns on and off while hand
spray gun is closed
Appliance does not switch off when the
hand-spray gun is closed
Detergent is not being sucked in
Pump leaky
Possible cause
Power supply interrupted
Disturbances in the electrical sys-
tem
Power switch
Pressure switch
Nozzle soiled
Air within the system
Insufficient water quantity
Suction area blocked
Pressure interruption
Tightness of system
Pressure interruption
Pressure interruption
Low or no detergent flow
Water leak between the cylinder
head and the piston casing
Oil leaks between the cylinder head
and the piston casing
Correction
Check connection cable for damages.
Check mains fuses and mains voltage
Check / replace transformer.
Check/replace the fuse.
Check thermal motor protection switch.
Check / replace the contactor.
Check/replace the PCB.
Check/replace the appliance switch.
Check/replace the pressure switch.
Set nozzle to "High pressure".
Clean the nozzle.
Replace the nozzle.
Vent appliance.
Check water supply level (refer to technical
data).
Clean the sieve in the water connection.
Check all inlet pipes to the pump.
Check the pressure and suction valves for
leaks / replace.
Check / adjust/ replace overflow valve.
Check the trigger gun and the O-rings on
the high-pressure hose for leaks / replace.
Check / adjust/ replace overflow valve.
Check / replace the pressure retaining
valve.
Check/replace the pressure switch.
Check / clean / replace the detergent
check valve.
Check the pressure and suction valves for
leaks / replace.
Check / adjust/ replace overflow valve.
Check / replace the pressure retaining
valve.
Check/replace the pressure switch.
Check/ clean detergent suction hose with
filter.
Open or check/clean detergent dosing
valve.
Check / clean / replace the detergent
check valve.
Check / replace nozzle for detergent.
Replace detergent injector.
Check / replace high pressure and low
pressure seals.
Replace oil seals.
English 5.905-945.0 Rev. 00 (06/15)
25