Technical data

8. Trouble Shooting
Electrical energy can cause severe injuries. Defective electrical compo-
nents to be immediately replaced, possible causes for accidents to be
eliminated without delay. Any repair work must only be carried out by
qualified personnel.
Only original Unitor equipment to be installed, as otherwise warranty
and Declaration of Conformity will cease, health and safety standards are
not guaranteed.
During repair or maintenance work, unit to be disconnected from
electrical network.
Malfunction Cause Remedy
Electric motor does not start. - Machine not connected to power
source.
- Fuse burnt.
- Low water cut- out activated.
- Emergency STOP locked
(after production date 07/2005).
- ON/OFF switch not pressed.
- Phase missing.
- Insufficient water supply.
- Connect machine to power source,
switch on main switch.
- Replace fuse. If it burns again, call
qualified service.
- Ensure sufficient water supply.
- Unlock emergency STOP.
- Press ON/OFF switch.
- Phase to be mounted as per electric
wiring diagram.
- Ensure sufficient water supply.
Electric motor suddenly stops,
motor protection switch trips.
- Low water supply
- Fuse burnt.
(phase missing).
- Low voltage.
- Eliminate cause and re-start machine
with ON/OFF switch.
- Replace fuse. If it burns again or motor
gives noise, call qualified service.
- Ensure correct power supply.
Electric motor gives noise upon start-up. - Fuse burnt.
(phase missing).
- Fault in electrical network
- Replace fuse. If it burns again, call
qualified service.
- Check phases in electric plug.
Operating pressure not achieved/varies - Nozzle worn.
- Incorrect nozzle.
- Nozzle partly clogged.
- Water filter dirty.
- Unloader valve leaking.
- Suction valves sticking/dirty.
- Replace nozzle.
- Install correct nozzle.
- Remove/clean/re-install nozzle.
- Replace filter cartridge.
- Call qualified service.
- Remove/clean/re-install valves.
Vibrations on high pressure hose and
spray pistol
- Air in unit - Bleed unit.
Open pressure regulating handle and
pistol, until continuous pressure is
reached.