Troubleshooting - Kärcher HD 728 B CAGE Originalbetriebsanleitung

High pressure hose
Danger
Risk of injury!
 Check the high pressure hose for dam-
ages (risk of bursting).
Please arrange for the immediate ex-
change of a damaged high-pressure hose.
Frost protection
ATTENTION
Risk of damage! Freezing water in the ap-
pliance can destroy parts of the appliance.
Store the appliance in a heated room dur-
ing winter or empty it. During longer breaks
in operation, it is advisable to pump in anti-
frost agents into the appliance.
Drain water
 Screw off water supply hose and high
pressure hose.
 Operate device for max. 1 minute until
the pump and conduits are empty.
Flush device with anti-freeze agent
Note:
Observe handling instructions of the anti-
freeze agent manufacturer.
 Pump in conventional frost protection
agents through the appliance.
A certain corrosion protection is achieved
with this as well.

Troubleshooting

DANGER
Risk of injury if the machine is left running
in an unattended state. Remove the spark
plug connector prior to performing any work
on the device.
Risk of burns! Do not touch hot mufflers,
cylinders or radiator ribs.
Appliance is not running
Follow operating instructions of the engine
manufacturer!
– Safety thermostat at the high pressure
pump has switched off the appliance af-
ter long period of cycle operation.
 Allow the appliance to cool down; then
restart it. Refer section "Interrupting op-
eration".
18
Device is not building up pressure
– Operating speed of the engine is too low
 Check operating speed of the engine
(refer to technical data).
– Nozzle is set to "CHEM"
 Set nozzle to "High pressure".
– Nozzle is blocked/ washed out
 Clean/ replace nozzle.
– Sieve in the water connection is dirty
 Clean sieve.
– Air within the system
 Appliance ventilation:
– Amount of water supply is too low.
 Check water supply level (refer to tech-
nical data).
– Pipe inlets to pump are leaky or blocked
 Check all inlet pipes to the pump.
Device leaks, water drips from the
bottom of the device
– Pump leaky
Note:
3 drops/minute are allowed.
 With stronger leak, have device
checked by customer service.
Pump is vibrating
– Inlet pipes to the pump are leaky.
 Check all inlet pipes to the pump.
– Air within the system
 Appliance ventilation:
Detergent is not getting sucked in
– Nozzle is set to "High pressure"
 Set nozzle to "CHEM".
– Detergent suction hose with filter is
leaky or blocked
 Check/ clean detergent suction hose
with filter.
– Backflow valve in the connection of the
detergent suction hose is jammed
 Clean/ replace backflow valve in the
connection of the detergent suction
hose.
– Detergent dosing valve is closed or
leaky/ blocked
 Open or check/clean detergent dosing
valve.
– 7
EN