Troubleshooting - Kärcher HDS 7/12 M Service Manual

9

Troubleshooting

Failure
Device is not running (no LED/display indication)
Device is not running, LED standby is on or the
display shows three filling levels
Winding protection contact was triggered
Water pressure too low
Water is not being heated
Control LED is on
During operation, all 10 LEDs are blinking at the
same time, device switches off
Inadequate or no detergent function
Pressure reduction in the HP system
Water leak between the cylinder head and the pis-
ton casing
Oil leaks between the cylinder head and the pis-
ton casing
Pump is vibrating
Measure
Check/replace mains voltage, connecting cable and mains
–
fuse.
Check the fuse (F1).
–
Check/replace the power switch.
–
Check/replace the pressure switch
–
Check/adjust/replace control transformer.
–
Check/replace the temperature fuse.
–
Check/replace the PCB.
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Unplug the RFID cable from the PCB and switch RFID in the
–
software.
Check pressure switch electrically and mechanically.
–
Switch off appliance and let it cool down. Remove the cause of
–
the problem. Turn on the appliance again.
Check/raise the water input amount.
–
Check/clean/replace water fine filter.
–
Vent appliance.
–
Check/replace high-pressure nozzle.
–
Check/replace the pressure and suction valves
–
Check / adjust/ replace overflow valve.
–
Check/adjust/replace safety valve.
–
Check/correct temperature setting.
–
If the water shortage safeguard is switched off, ensure suffi-
–
cient water supply/repair water shortage safeguard.
Check/refill fuel level in the tank.
–
Check/replace the solenoid valve fuel pump.
–
Check/replace fuel filter.
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Check/correct the setting of the fuel pump.
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Check/correct fuel nozzle.
–
Check/replace ignition cables.
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Check/correct distances of the ignition electrodes.
–
Check/repair burner blower.
–
Check/correct setting of the air flap.
–
5.4.1Control panel with LED indicator
–
Check service switch and ribbon cable.
–
Check/correct dosing valve setting.
–
Check/clean detergent tank.
–
Check/clean/replace detergent filter.
–
Check/replace detergent hose, dosing valve and detergent in-
–
let at the cylinder head.
Check the trigger gun and the O-rings on the high-pressure
–
hose for leaks / replace.
Check the pressure holding valve for leaks/replace the O-
–
rings.
Check / adjust/ replace overflow valve.
–
Check/replace the pressure switch and control piston.
–
Leakiness of 1 drop per minute and piston is acceptable.
–
Check/replace high pressure and low pressure seals.
–
Replace the oil seals.
–
Check pump for leaks/eliminate leaks.
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Vent appliance.
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English 5.906-432.0 Rev. 00 (06/15)
117