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Faults without display on the console
Fault Possible cause Remedy of whom
Appliance stops, display
switches off
Blown fuse. Replace fuse. Operator
No power supply to inverter because of
battery undervoltage or overvoltage.
Check battery, charge if necessary. Operator
Inverter defective. Replace inverter. Customer Service
No display after switching
the appliance on
Battery depleted. Charge battery. Operator
Blown fuse. Replace fuse. Operator
Front cover open. Close front cover. Operator
Emergency stop switch depressed. Unlock the emergency-stop switch by pull-
ing.
Operator
No power supply to inverter because of
battery undervoltage or overvoltage.
Check battery, charge if necessary. Operator
Inverter defective. Replace inverter. Customer Service
Motor will not start or turns
off immediately
Inform Customer Service.
Working pressure is fluctu-
ating
Leak in the suction section of the high-
pressure pump.
Check line system. Customer Service
Valves worn. Replace valves. Customer Service
Burner sooting Burner incorrectly adjusted or soiled. Adjust or clean burner. Customer Service
Solenoid valve fuel defective, diesel fuel is
dripping.
Check the solenoid valve; replace solenoid
or solenoid valve if necessary.
Customer Service
White smoke from the burn-
er
No ignition spark (can be detected through
the sight glass in the burner lid).
Inform Customer Service. Operator
Condensation in the nozzle holder. Check, clean the nozzle holder. Customer Service
Fuel pressure too low. Check the fuel pump. Customer Service
Indicator light front cover/
emergency stop is on
The front cover was opened during the op-
eration.
Close front cover. Operator
Safety switch front cover defective. Check safety switch. Customer Service
Emergency stop switch depressed. Unlock the emergency-stop switch by pull-
ing.
Operator
Water leaks from the bot-
tom of the device.
High-pressure pump is leaky. Note: 3 drops/minute are allowed.
With stronger leak, have device checked
by customer service.
Customer Service
Device is not building up
pressure
Nozzle is blocked/ washed out. Clean/ replace nozzle. Operator
Operating speed of the motor is too low. Check the operating speed of the motor. Customer Service
HDS 9/50, HDS 13/35 only (optional with
HDS 13/20, HDS 17/20):
Speed control defective.
Check speed control. Customer Service
Safety valve is leaky. Check the setting; install new washers, if
required.
Customer Service
Supply lines to the pump are leaky or
clogged.
Check all inlet pipes to the pump. Customer Service
High pressure pump is vi-
brating
Supply lines to the pump are leaky. Check all inlet pipes to the pump. Customer Service
HDS 13/20, HDS 17/20 on-
ly:
Inadequate or no flow of
detergent
Detergent dosing valve is closed or leaky/
blocked
Open or check/clean detergent dosing
valve.
Operator
Detergent suction hose with filter is leaky
or blocked
Check/ clean detergent suction hose with
filter.
Operator
Detergent solenoid valve leaky or clogged. Check, clean detergent solenoid valve. Customer Service
Electronics or detergent solenoid valve is
defective.
Replace electronics or detergent solenoid
valve.
Customer Service
Overflow valve keeps
switching on/off when the
hand-spray gun is opened
Nozzle is blocked Clean the nozzle. Operator
Appliance is decalcified Decalcify appliance. Customer Service
Overflow valve is defective. Replace overflow valve. Customer Service
Switching point of the overflow valve has
changed.
Adjust the overflow valve. Customer Service
36 EN
36


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