Karcher HD 728 B Cage - Manual (Page 18)

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Warning
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.
 Screw off water supply hose and high
pressure hose.
 Operate device for max. 1 minute until
the pump and conduits are empty.
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.
ƽ
Danger
Risk of injury if the machine is left running
in an unattended state. Remove the spark
plug before doing any work on the appli-
ance.
Risk of burns! Do not touch hot silencers,
cylinders or radiator ribs.
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".
– 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.
– Pump leaky
Note
3 drops/minute are allowed.

With stronger leak, have device
checked by customer service.
– Inlet pipes to the pump are leaky.
 Check all inlet pipes to the pump.
– Air within the system
 Appliance ventilation:
– 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
Frost protection
Drain water
Flush device with anti-freeze agent
Troubleshooting
Appliance is not running
Device is not building up pressure
Device leaks, water drips from the
bottom of the device
Pump is vibrating
Detergent is not getting sucked in
18 EN