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Troubleshooting
Malfunction
Water supply
Water tank runs over.
Water tank does not fill completely.
Pump does not suck.
Test: check water and chemical
system for tightness.
High-pressure pump
Pump makes loud noises.
Operating pressure is not reached.
Water drops from the pump.
Oil drops from the transmission.
Pressure is too low.
Machine does not switch off
Test: Bridge pressure switch (red)
Appliance does not start or
stopps during operation
Cause of malfunction / remedy
Float valve is dirty or defective.
Float valve is defective. Water filter is dirty.
Insufficient water inlet quantity.
Valves stick or are dirty. Suction hose leaks.
Chemistry valve is open or leaks. Check hose clips
(connections). High-pressure nozzle is clogged.
Connect water inlet directly to the pump (2-8 bar
pre-pressure). Disconnect suction lines below the
pump
Pump sucks air. Check suction connections.
Check high-pressure nozzle. Check valves. Check
O-rings under valves. Check sleeves. Manometer
is defective. Unloader: check stainless steel seat
and ball. Check seals on the control piston.
Replace sleeves in the pump.
Replace O-rings.
Check oil seals (replace). Check plunger and plun-
ger guides. Check water supply, since water defici-
ency or air suction can cause damage to seals and
O-rings (chemistry valve leaks?)
Worn high pressure nozzle. Stainless steel seat,
ball, O-ring in unloader is dirty or defective.
Manometer is defective.
Check return body and O-ring in unloader of the
valve housing.
Check pressure switch (red). Check micro switch.
Check cable connections. Board is defective.
Check electricity supply. Check main switch.
Check cable connections. Check board.
Check pressure switch. Switch off by overcurrent
release.
Malfunction
Machine does not start
Electrical heating elements
Insufficient water temperature.
Leakage
Gun drips. High pressure hose drips.
Manometer indicates pressure, but no
water comes out of HP-hose.
Cause of malfunction / remedy
Check electricity supply.
Check main switch.
Check cable connections.
Board defective.
Check pressure switch.
Switch off by overcurrent release.
Check electricity:
- ON-OFF - Switch
- Contactor
- Flow monitoring device
Clean nozzle. Replace seals.
Replace O-ring below screwed connection.
Clean nozzle.
14


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