Troubleshooting Guide - Kärcher HDS 8/20 De Handbuch

Cleaning the sieve in the safety block
1. Open the high-pressure gun until the device is com-
pletely depressurised.
2. Pull out the securing clip.
3. Pull the hose section out of the safety block.
4. Pull the sieve out of the safety block.
5. Clean the sieve under running water.
6. Mount the components in the reverse order.
Replacing the oil in the high-pressure pump
For the oil type and filling quantity see chapter Techni-
cal data.
1. Provide a catch pan for at least 1 litre of oil.
2. Unscrew the oil drain plug.
3. Drain the oil into the catch pan.
4. Screw in the oil drain plug.
5. Slowly fill with new oil until the middle of the oil level
indication is reached. Air bubbles must be able to
escape.
Descaling the device
If deposits accumulate in the pipelines, this will increase
the flow resistance and the motor load will get too high.
DANGER
Flammable gases
Risk of explosion
Do not smoke during the descaling process.
Ensure good ventilation.
DANGER
Acids
Risk of acid burns
Wear safety goggles and protective gloves.
According to legal regulations, only approved scaling
solvents with test symbol may be used for descaling.
 RM 101 (order number 6.295-398.0)
1. Fill a container for 20 litres with 15 litres of water.
2. Add 1 litre of scale remover.
3. Connect the water hose to the water connection and
hang the free end in the container.
4. Insert the connected spray lance without the high-
pressure nozzle in the container.
5. Start the motor according to the original instructions
for the motor.
6. Open the high-pressure gun and do not close it
again during descaling.
7. Set the temperature controller to a working temper-
ature of 40 °C.
8. Let the device run until the working temperature is
reached and the burner goes out.
9. Switch off the device and allow it to stand for 20 min-
utes. The high-pressure gun must remain open.
10. Pump the device empty.
Note
We then recommend pumping an alkaline solution (e.g.
RM 81) through the device to protect against corrosion
and neutralize the acid residues.
Vent the device
1. Open the water inlet.
2. Remove the high-pressure nozzle.
3. Start the motor according to the original instructions
for the motor.
4. Allow the device to run until the escaping water is
free of air bubbles.
5. Switch off the device.
6. Fit the high-pressure nozzle.
22

Troubleshooting guide

DANGER
Danger due to device inadvertently starting up
Risk of injury
Disconnect the fuel supply prior to all work on the de-
vice.
CAUTION
Hot surfaces
Risk of injury
Allow the device to cool down prior to all work.
Motor not running
1. See original instructions for the motor.
The fuel tank is empty
1. Fill the fuel tank.
The oil level in the motor is too low
1. Check the oil level in the motor.
2. Refill oil.
Device not building up pressure
A wrong high-pressure nozzle is mounted on the spray
lance.
1. Fit the standard nozzle (see chapter Technical da-
ta).
The high-pressure nozzle is clogged / washed out
1. Clean / replace the high-pressure nozzle.
Air is in the system
1. Vent the device (see chapter Vent the device).
The water filter is clogged
1. Clean the water filter (see chapter Cleaning the wa-
ter filter).
The sieve in the safety block is clogged
1. Clean the sieve in the safety block (see chapter
Cleaning the sieve in the safety block).
The water supply volume is too low
1. Check the water supply volume (see chapter Tech-
nical data).
The safety valve is adjusted
1. Have the safety valve adjusted by the authorized
Customer Service.
The safety valve is leaking
1. Have the safety valve or seal replaced by the au-
thorized Customer Service.
The overflow valve is defective
1. Have the overflow valve replaced by the authorized
Customer Service.
Uneven water jet
The high-pressure nozzle is clogged
1. Clean the high-pressure nozzle.
The safety valve is adjusted
1. Have the safety valve adjusted by the authorized
Customer Service.
Oil in the high-pressure pump milky
The seal is defective
1. Contact the authorized Customer Service.
The burner does not ignite
The temperature limiter has triggered repeatedly
1. Have the device checked by the authorized Custom-
er Service.
The fuel tank is empty
1. Fill the fuel tank.
The water volume is too low
1. Check the water connection.
2. Check the supply lines.
3. Clean the sieve in the safety block (see chapter
Cleaning the sieve in the safety block).
The fuel pump is defective
1. Have the fuel pump replaced by the authorized Cus-
tomer Service.
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