LAVAZZA LB 4712 Maintenance Manual page 30

PROBLEM
The leds of all the keyboard
flash.
The pump works only with the
manual dispensing key.
Shut down of the electronic
system.
The pump leaks water.
The motor stops suddenly or the
thermal protector is activated
due to an overload.
26
CAUSE
after a few minutes the automatic filling
of water stops.
Time-out device is activated.
no water in mains.
The automatic level valve is closed.
Some of the pipes in the circuit are
clogged.
The probe and/or the earth are
disconnected.
The pump fuse of the electronic control
unit is damaged.
The control unit fuse is burnt out.
The flowmeter has a contact between the
positive pole and the earth.
Poor mechanical seal of the shaft or the
o-Ring.
The inlet and outlet connections are
loose.
The hexagonal nut of the pressure relief
valve or the filter are loose.
The gasket or the o-Ring of the pressure
relief valve of the filter are defective.
lime scale and mineral build-ups in the
pump have caused it to jam.
The pump and the motor are not aligned. Install the pump-motor joint.
The motor is defective.
The motor is connected with an incorrect
voltage.
Maintenance manual for technical assistance
SOLUTION
Turn the machine off and then back
on.
open the water mains tap.
open the automatic level valve.
check and replace the defective
pipes.
check and restore the connections.
Replace the pump fuse of the elec-
tronic control unit (10 a).
Replace the main fuse
(125 ma).
check the connection of the
flowmeter.
check the pump and take any cor-
rective actions.
Tighten the connectors.
Tighten the hex connection of the
pressure relief valve or the filter.
Replace the gasket and the o-Ring,
take care not to change the calibra-
tion of the valve.
check the pump and replace it, if ne-
cessary.
Replace the motor.
ensure that the power supply voltage
of the motor is correct.
Manual code 10066846 / Rel. 0.00 / March 2012