Troubleshooting - Kärcher HD 6/16-4 M / MX Service Manual

9

Troubleshooting

Findings
Appliance is not running
Appliance is not building up pressure Nozzle soiled
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
Pump is vibrating
24
English 5.906-246.0 Rev. 01 (09/14)
Possible cause
Power supply interrupted
Engine is overheated
Power switch
Pressure switch
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
Pipes
Dosing valve
Air within the system
Correction
Check connection cable for damages.
Check the supply voltage.
Turn device switch on "0" and let engine
cool off for min. 5 minutes.
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 tech-
nical 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 / re-
place.
Check / adjust/ replace overflow valve.
Check / replace the pressure retaining
valve.
Check / replace the pressure switch /
control piston.
Check / adjust/ replace overflow valve.
Check / replace the pressure retaining
valve.
Check/replace the pressure switch.
Check / replace the pressure switch /
control piston.
Set nozzle to "CHEM".
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.
Check / replace piston.
Check suction pipes for water and de-
tergent and ensure that they are leak-
proof.
Close dosing valve for detergent to op-
erate the machine without detergent.
Vent appliance.