Troubleshooting - LAVAZZA LB 4712 Maintenance Manual

Maintenance manual for technical assistance
9.

TROUBLESHOOTING

9.1. Signalling and solutions to the most common problems
PROBLEM
no electrical power on the
machine.
no water in the boiler.
Too much water in the boiler.
no steam from pipes.
Manual code 10066846 / Rel. 0.00 / March 2012
CAUSE
The selector switch is placed to "0" or "1"
position.
The on/off switch is damaged.
The network switch is placed to oFF po-
sition.
The connection to the electrical network
is defective.
The valve of the water mains is closed.
The valve to bypass the automatic level
is closed.
The pump filter is clogged.
The power pump is disconnected or
blocked.
The water inlet solenoid valve is
damaged.
The filter of the water inlet solenoid valve
is clogged.
The solenoid valve of the automatic level
device is damaged.
The heat exchanger is perforated.
The solenoid valve of the automatic level
device remains connected.
The electrical heating element is
defective.
The pressure switch contacts are
oxidized.
The heating element protection thermo-
stat has tripped.
The nozzle of the pipe is clogged.
on/off switch is placed to "1" position.
SOLUTION
Turn the selector switch to "2" posi-
tion.
Replace the on/off switch.
Place the network switch to on posi-
tion.
check for possible connection de-
fects.
open the water mains valve.
open the automatic level valve.
Replace the pump filter.
check the power pump.
Replace the water inlet solenoid
valve.
clean or replace the solenoid valve
filter.
Replace the solenoid valve of the au-
tomatic level device.
Replace the heat exchanger.
check the level probe, the earth of
the frame and the operation of the
electronic control unit.
Replace the electrical heating
element.
clean the contacts or replace the
pressure switch.
Reset the heating element protection.
clean the steam nozzle.
Turn the machine switch to "2" posi-
tion.
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