LAVAZZA LB 4712 Maintenance Manual page 28

PROBLEM
Steam mixed with water comes
out from pipes
The machine does not dispense.
Water leaks from the machine.
coffee is cold.
24
CAUSE
The boiler level is too high.
no water mains.
The solenoid valve of the brewing unit is
defective.
The pump is jammed.
The fuse of the control unit is burnt out.
The injector is clogged.
The brewing unit solenoid valve is
clogged or dirty.
The flowmeter is jammed.
The drain tray does not discharge.
The drain pipe is broken or detached or
clogged.
Water leaks in the hydraulic circuit.
The heating element is damaged.
The electrical connection is defective.
lime scale on the exchangers and/or the
heating element.
The pressure switch contacts are
oxidized.
Maintenance manual for technical assistance
SOLUTION
check the level probe for correct po-
sition and presence of any surface
lime scale.
check that there is water in the
mains.
Replace the solenoid valve of the
brewing unit.
Replace the pump.
Replace the solenoid valve protection
fuse (1a).
clean or replace the injector.
clean or replace the solenoid valve.
check/replace the flowmeter.
check the sewer drain.
check and restore the connection of
the drain pipe to the drain tray.
check and eliminate any hydraulic
leaks.
Replace the electrical heating
element.
check for possible defects on the
connection.
clean the machine.
clean or replace the pressure switch
contacts.
Manual code 10066846 / Rel. 0.00 / March 2012