Kärcher HDC 20/8 Manual page 26

Fault
Appliance is not running; indica-
tor lamp for operations readi-
ness is not illuminated
Pump starts during the stand-by
period and not when the hand
spray gun is opened.
Full pressure does not build up
in the appliance
High pressure pump is knock-
ing; manometer is swaying wild-
ly
Overflow valve opens and clos-
es continuously during 0 takeo-
ver
Indicator lamp "water low" is il-
luminated (error no. 01)
Indicator lamp "engine over-
heated" is illuminated (error no.
02)
Indicator lamp "collection error"
is blinking (error no. 03)
Indicator lamp "collection error"
is blinking (error no. 04)
Indicator lamp "collection error"
is blinking (error no. 05)
Indicator lamp "collection error"
is blinking (error no. 06)
Indicator lamp "collection error"
is blinking (error no. 07)
26
Possible cause
There is no voltage in the machine. Check electrical mains.
Main switch is switched off.
Motor protection switch for the con-
trol and the prepressure pump has
been triggered.
Control board defective, green
LEDs are not blinking.
Pressure sensor or cable to pres-
sure sensor defective.
Flushed the nozzle.
Suction site pipe leaking.
Safety valve is leaky.
Overflow valve is leaking or set too
low.
Valve in the pump defective, high-
pressure solenoid valve does not
close.
Pump is sucking air.
Valve plate or valve spring is defec-
tive.
Advance pump calcified or defec-
tive.
Leakage in the high-pressure pipe-
line system or hand spray gun leak-
ing.
Backflow valve or control piston
seal leaking in overflow valve.
The water shortage safeguard in
the swimmer tank has got activat-
ed.
Swimmer valve is jammed.
Thermal sensor in the engine or the
over-current protection switch has
been triggered.
The temperature sensor in the
swimmer tank has been activated.
Leakage in the high-pressure pipe-
line system.
Too many consumer loads open at
the same time.
Flow switch defective.
Leakage in the high-pressure pipe-
line system.
Flow switch defective.
Pressure sensor does not transmit
signal.
Temperature sensor does not
transmit signal.
Remedy
Turn on the main switch.
Check motor protection switch.
Check control board, replace if necessary.
Replace pressure sensor or cable.
Replace the nozzle.
Check screw fittings and hoses.
Check the setting; install new washers, if re-
quired.
Check valve parts; replace damaged parts;
clean the dirt.
Replace defective components.
Check suction system and remove leaks.
Replace defective components.
Check advance pump.
Locate and seal leakage.
Repair the overflow valve.
Remove the water shortage.
Check swimmer valve for free movement.
Rectify cause for over-loading.
Reduce water infeed temperature.
Locate and seal leakage.
Close some consumer loads.
Replace flow switch.
Locate and seal leakage.
Replace flow switch.
Check pressure sensor, replace if required. Customer Service
Check temperature sensor, replace if re-
quired.
10
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EN
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