Wega Espresso Coffee Machine Use And Maintenance Manual page 27

Indication
COFFEE IS
TOO HOT
DELIVERY
OF COFFEE
IS TOO FAST
DELIVERY
OF COFFEE
TOO SLOW
COFFEE GROUNDS ARE
WET
THE GAUGE SHOWS AN
UNACCEPTABLE
PRESSURE
GROUNDS
IN CUP
for EVD:
COFFEE DELIVERY
ONLY BY MEANS OF
MANUAL KEY
for EVD:
INCORRECT
COFFEE DELIVERY
THE COFFEE DOSE IS NOT
MET
THE LED OF THE
DOSE PUSH BUTTON
FLASHES
for EVD:
ALL THE LED OF ALL THE
PUSH BUTTON PANELS
FLASH
for EPU-EVDT:
THE FRONT LED
FLASHES
espresso coffee machine - instructions for technician
Cause
1) Boiler temperature is too high
2) The flow reducer of the group is not suitable
1) The coffee is ground too coarsely
2) The diameter of the injector is too large
3) Boiler temperature is too high
1) Coffee is ground too finely
2) The injector is clogged
3) The delivery group is clogged
4) The filter holder is dirty
1) The group solenoid valve discharge is clogged
2) The delivery group is too cold
3) Coffee is ground too finely
1) The gauge is defective
2) Incorrect pressure switch calibration.
3) Incorrect motor pump calibration.
1) The filter holder is dirty
2) The filter holes are worn
3) The coffee is not ground evenly
4) The undercup seal is worn
5) The temperature of the delivery water is high
1) The control unit fuse is burned out
2) The coil of the solenoid valve does not work
correctly or has shorted out
1) The connection of the volumetric dosing device
is defective
2) The connection of the electronic control unit
is defective
3) The connector of the volumetric dosing device
has humidity on it
4) The volumetric dosing device is defective: during
delivery the dosing device LED does not flash
5) The coffee is ground too finely: there is not
sufficient water flow in the dosing device
6) The non-return valve loses pressures
(the dose is too small)
7) The drain valves lose pressure
(the dose is too small)
8) Water leakage from the group solenoid valve during
coffee delivery or when at rest
9) The volumetric dosing device is partially obstructed
After a few minutes, automatic filling with water is stopped:
1) Time control device has cut in
2) No water in mains
3) The tap for the automatic level device is closed
4) Some of the tubes in the circuit are clogged
5) The probe and/or the earth are disconnected
Solution
1) Reduce pressure in the boiler by turning the appropriate screw
on the pressure switch
2) Replace the injector with one of a smaller diameter
1) Adjust the grinding of the coffee
2) Replace the injector with one of a smaller diameter
3) Reduce pressure in boiler
1) Adjust the grinding of the coffee
2) Replace the injector
3) Check and clean the delivery group
4) Clean and if necessary replace the filters
1) Clean the group drain
2) Wait for group to heat up completely
3) Adjust the grinding of the coffee
1) Replace the gauge
2) Adjust the calibration of the pressure switch
3) Adjust the calibration of the motor pump
1) Clean the filter holder
2) Replace the filter
3) Replace the grinders
4) Change the seal
5) Check the causes and eliminate the problem
1) Replace the control unit fuse (1A)
2) Replace the coil of the solenoid valve
1) Check for proper connection of the
volumetric dosing device connector
2) Check for proper connection of the
8-pole connector of the electronic control unit
3) Remove the connector of the volumetric dosing device
and thoroughly dry the contacts
4) Replace the heads of the volumetric dosing device
or replace the dosing device
5) Adjust the grinding suitably
and if necessary check the grinders
6) Check and if necessary replace the
non-return valve
7) Check and if necessary replace the
drain valves
8) Clean and if necessary replace
the solenoid valve
9) Clean or replace the volumetric dosing device
1) Turn the machine off and then back on
2) Open the water mains tap
3) Open the automatic level device tap
4) Check and replace the defective tubes
5) Check and restore connections
R
27
English