LAVAZZA LB 4712 Maintenance Manual page 31

Maintenance manual for technical assistance
PROBLEM
The pump works below the
nominal capacity
The pump is noisy.
The cup is dirty with
splashed coffee.
Manual code 10066846 / Rel. 0.00 / March 2012
CAUSE
The inlet is clogged even partially.
The pump rotates in the wrong direction.
The pump is not properly calibrated.
The motor runs at a low RPM.
The motor runs at a low RPM.
The inside of the pump is damaged due
to the infiltration of foreign matter.
The pump and the motor are not aligned. Install the pump-motor joint.
The gasket or the o-Ring of the pressure
adjusting screw or the filter is defective.
The joint, the coupling screw or the V-
shaped clamp, are loose.
The inlet is clogged even partially.
The hex nut of the pressure adjusting
screw or the filter are loose.
Steam pockets during brewing.
air pockets in the hydraulic circuit.
The flow reducer of the brewing unit is
unsuitable.
SOLUTION
clean the pump filter.
check the motor.
calibrate the pressure adjusting
screw.
check the voltage or replace the
motor.
Replace the pump.
Replace the gasket and the o-Ring,
take care not to change the calibra-
tion of the valve.
align and tighten the components
which are loose.
clean the filter-holder.
Tighten the hex connection of the
pressure adjusting screw and the filter.
Reduce the water temperature.
Tighten fittings or connectors which
are loose.
Replace the flow reducer.
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