Wega LB 4200 Manual De Uso página 46

INDICATION CAUSE
GROUNDS IN CUP • The temperature of the delivery water is high
• The connection of the volumetric dosing device is faulty
• The connection of the electronic control unit is faulty
• The connector of the volumetric dosing device has humidity on it
INCORRECT COFFEE
DELIVERY
• The volumetric dosing device is faulty: during delivery the
dosing device, LED does not flash
THE COFFEE DOSE IS
• The non-return valve loses pressure (the dose is too small)
NOT MET
• The drain valves lose pressure (the dose is too small)
• Water leakage from the group solenoid valve during coffee
delivery or when in stand-by
• The volumetric dosing device is partially obstructed
• The inlet is clogged, perhaps only partially
THE VIBRATION PUMP
FUNCTIONS BELOW • The inside of the pump is damaged due to the infiltration of
NOMINAL CAPACITY
foreign materials
• Steam pockets in the delivery system
THE CUP IS DIRTY WITH
SPLASHED COFFEE • Air pockets in the hydraulic circuit
DOSE VOLUME
DIFFERENT FROM THE • Air pockets in the hydraulic circuit
ONE PROGRAMMED
!
If the problem cannot be resolved, turn the machine off and call for Technical Assistance. Do not attempt any sort of repairs.
The descaling of the machine must be carried out by professional technicians to ensure that such operation does not lead to
release of hazardous materials for food use.
46
instructions for the user
SOLUTION
• Change the temperature of the unit and/or boiler
• Check for proper connection of the volumetric dosing device
connector
• Check for proper connection of the electronic control unit
connector
• Remove the connector of the volumetric dosing device and
thoroughly dry the contacts
• Replace the heads of the volumetric dosing device or replace
the dosing device
• Check and replace the non-return valve, if necessary
• Check and replace the drain valves, if necessary
• Clean and replace the solenoid valve, if necessary
• Clean or replace the volumetric dosing device
• Clean the tank filter and the water through filters
• Replace the vibration pump
• Decrease the temperature of the unit and/or boiler
• Perform some empty runs
• Bleed as shown in chap. 7.2