English
17
Changing oil
See the "Technical data" section for the oil filling quanti-
ty and type.
1. Provide a catch pan for approx. 0.5 litre of oil.
2. Loosen the oil drain plug.
3. Drain the oil into the catch pan.
Note
Dispose of the old oil in an environmentally friendly
manner or hand it over to an authorised collection point.
4. Retighten the oil drain plug, torque 20-25 Nm.
5. Unscrew the oil filler plug.
6. Slowly fill with new oil until the level is in the middle
of the oil level display. The air bubbles must be able
to escape.
7. Screw in the oil filler plug.
Descale the device
Deposits accumulating in the pipelines increase the flow
resistance and the motor load becomes too high.
DANGER
Hazard due to inflammable gases
Risk of explosion
Do not smoke during the descaling process. Ensure
good ventilation.
DANGER
Acid danger
Risk of acid burns
Wear safety goggles and protective gloves.
Execution:
According to legal regulations, only approved boiler sol-
vents with a test certificate may be used for removing
deposits.
●
RM 101 (order number 6.295-398.0)
1. Fill a 20 litre container with 15 litres of water.
2. Add 1 litre of scale solvent.
3. Connect the water hose directly to the pump head
and hang the free end into the container.
4. Place the connected spray lance in the container
without a nozzle.
5. Switch the device on.
6. Open the high-pressure gun and do not close it
again during descaling.
7. Switch the device off and allow it to stand for 20 min-
utes. The high-pressure gun must remain open.
8. Then pump the device empty.
Note
For the purposes of corrosion protection and neutralis-
ing acid residues, we recommend then pumping an al-
kaline solution (e.g. RM 81) through the device.
Troubleshooting guide
DANGER
Inadvertently starting up device, touching live com-
ponents
Risk of injury, electric shock
Switch off the device before performing any work on the
device.
Remove the mains plug.
Device not running
No mains voltage
1. Check the power supply and the supply line.
Fault in the voltage supply or current consumption of the
motor too high
1. Check the power supply and the mains power sup-
ply circuit breaker.
2. Contact Customer Service.
Motor overloaded/overheated or the exhaust gas ther-
mostat has triggered or the protective winding contact of
the blower motor has triggered
1. Set the trigger to "0/OFF".
2. Allow the device to cool down.
3. Switch the device on.
Malfunction occurs repeatedly
1. Contact Customer Service.
Flame sensor has switched off the burner
1. Contact Customer Service.
The fuel indicator light lights up
Fuel tank is empty
1. Refill the fuel.
Device not building up pressure
Air in the system
1. Venting the pump:
a Unscrew the nozzle from the spray lance.
b Allow the device to run until the escaping water is
free of air bubbles.
c In the case of venting problems, allow the device
to run for 10 seconds and then switch it off. Re-
peat the procedure several times.
d Switch off the device.
e Screw the nozzle back on.
2. Check connections and lines.
Fine filter dirty
1. Clean the fine filter, replace if necessary.
Water supply volume too low
1. Check the water supply volume (see "Technical da-
ta").
Device is leaking, water is dripping from the bottom
of the device
Pump leaking
1. If there is a significant leak, have the device
checked by Customer Service.
Note
3 drops/minute are permitted.
The device switches on and off continuously when
the high-pressure gun is locked
Leak in the high-pressure system
1. Check the high-pressure system and the connec-
tions for leaks.
Burner not igniting
Water shortage
1. Check the water connection and the supply lines.
2. Clean the sieve in the water shortage safeguard.
Fuel prefilter dirty
1. Clean/change the fuel prefilter.
Fuel filter dirty
1. Clean/replace the fuel filter.
No ignition spark
1. If no ignition spark is visible through the sight glass
during operation, have the device checked by Cus-
tomer Service.
Burner does not switch off despite the water short-
age
Leak in the high-pressure system
1. Check the high-pressure system and the connec-
tions for leaks.
Reed switch stuck in the water shortage safeguard or
magnetic piston stuck
1. Contact Customer Service.
The set temperature is not reached when operating
with hot water
Sooty heating coil
1. Have the soot removed from the device by Custom-
er Service.
Summary of Contents for HDS 9/20-4 Classic
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