Wega EVD Use And Maintenance Manual

TECHNICIANS' manual48 of 100
Problem Cause Action
THE COFFEE GROUNDS
ARE WET
• The group solenoid valve drain is clogged.
• The dispensing group is too cold.
• The coffee has been ground too nely.
• There's not enough ground coffee.
• Clean the group drain.
• Wait until the group has fully heated up.
• Adjust the coffee grinder.
• Increase the amount of ground coffee.
GROUNDS FOUND IN CUPS
• The lter holder is dirty.
• The lter holes are worn.
• The coffee has not been ground evenly.
• The group gasket is worn.
• The pump pressure is too high.
• Clean the lter holder.
• Replace the lter.
• Replace the grinders.
• Replace the seal.
• Adjust the pump pressure.
THE CUP IS DIRTY WITH
SPLASHES OF COFFEE
• There are steam pockets in the dispensing system.
• There are air pockets in the hydraulic circuit.
• The coffee has been ground too coarsely.
• Reduce the water temperature.
• Check the cause and resolve the problem.
• Adjust the grinder as appropriate.
THE COFFEE IS TOO COLD
• The heating element of the coffee heating unit
is faulty.
• The wiring is faulty.
• There is limescale on the exchangers and/or
heating element.
• The pressure switch contacts are oxidised.
• The heating element protection thermostat has
cut-in.
• Machine switch in “1” position
• In the CTS system, the lime scale has reduced
the circulation of water
• The dispensing group is cold.
• Replace the electrical heating element.
• Check for any faulty connections.
• Clean the machine.
• Clean the contacts or replace the pressure switch.
• Reset the safety heating element.
• Turn the machine switch to position "2".
• Clean the exchanger connections, and clean or re-
place the two circulation pipes.
• Eliminate air pockets in the hydraulic circuit in the
following manner:
• Disconnect the pump from the power supply.
• Close the softener’s water valve.
• Perform a dry dispensing run for a few minutes.
• Reconnect the pump to the power supply.
• Open the softener’s water outlet valve.
• Dispense until water comes out.
• Wait a few minutes for it to heat up.
THE COFFEE IS TOO HOT
• The heating unit temperature is too high.
• The group’s ow reducer is not suitable.
• Reduce the pressure in the heating unit using the
appropriate screw on the pressure switch.
• Replace the reducer with one of a smaller diameter.
COFFEE IS BEING
DISPENSED TOO QUICKLY
• The coffee has been ground too coarsely.
• The diameter of the injector is too big.
• The dose of ground coffee is too small.
• Adjust the coffee grinder.
• Replace the injector with one that has a smaller diam-
eter.
• Check the amount (grams) of ground coffee be-
ing used.
COFFEE IS BEING
DISPENSED TOO SLOWLY
• The coffee has been ground too nely.
• The injector is clogged.
• The dispensing group is clogged.
• The lter holder is dirty.
• Adjust the coffee grinder.
• Replace the injector.
• Check and clean the dispensing group.
• Clean and replace the lters, if necessary.
EVD version:
THE ELECTRONIC SYSTEM
HAS SHUTDOWN
• The control unit main fuse has burned out.
• One of the volumetric dosing device's contacts
is grounded.
• Replace the main fuse (125 mA).
• Check the volumetric dosing device connection.
EVD version:
COFFEE IS ONLY
DISPENSING VIA THE
MANUAL BUTTON
• The control unit fuse is burned out.
• The solenoid valve coil is malfunctioning or has
shorted.
• Replace the control unit fuse (1A).
• Replace the coil of the solenoid valve.

Wega EVD Specifications

General

Brand	Wega
Model	EVD
Category	Coffee Maker
Language	English