Wega Mininova Use And Maintenance Manual For The Technician page 38

MALFUNCTION
COFFEE IS TOO HOT
COFFEE DISPENSED TOO QUICKLY
COFFEE DISPENSED TOO SLOWLY
WET COFFEE GROUNDS
THE GAUGE INDICATES UNACCEPTABLE
PRESSURE
GROUNDS IN CUP
for EVD:
INCORRECT COFFEE DELIVERY
THE COFFEE DOSE IS NOT MET
THE LED OF THE DOSE BUTTON FLASHES
for EVD:
ALL THE LEDS OF ALL THE PUSH BUTTON
PANELS ARE FLASHING
for EPU:
FRONTAL LED IS FLASHING
SHUTDOWN OF THE ELECTRONIC SYSTEM
THE PUMP LEAKS WATER
38
CAUSE
1.
The temperature of the boiler is too high
2.
The flow reducer of the group is unsuitable
1.
Coffee is ground too coarsely
1.
Coffee is ground too finely
2.
The injector is clogged
3.
The group is clogged
4.
Filter holder is dirty
1.
The group solenoid valve drain is clogged
2.
The dispensing unit is too cold
3.
Coffee is ground too finely
1.
The pressure gaugeis faulty
2.
I n c o r r e c t m o t o r p u m p c a l i b r a t i o n
(versions EMA-EPU)
1.
The filter holder is dirty
2.
The filter holes are worn.
3.
The coffee is not ground evenly
4.
The seal under the pad is worn
5.
The temperature of the delivery water is high
1.
The connection of the volumetric dosing device
is faulty
2.
The connection of the electronic control unit
is faulty
3.
The connector of the volumetric dosing device
has humidity on it
4.
The volumetric dosing device is faulty: 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 drain valves lose pressure (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 in stand-by
9.
The volumetric dosing device is partially obstructed
After a few minutes, automatic filling with water is
stopped:
1.
The device is in time-out
2.
No water in mains/the inner tank is empty
3.
Some of the hoses in the circuit are clogged
4.
The probe and/or the mass are disconnected
1.
One of the volumetric dosing device's contacts
is grounded
1.
Poor mechanical grip of the shaft or O-Ring seal
(only with motorpump)
2.
The inlet and outlet connections are loose
3.
The hex nut of the pressure relief valve or filter
is loose (only with motorpump)
4.
The seal or O-Ring of the pressure relief valve or
filter is faulty (only with motorpump)
SOLUTION
1.
Reduce the pressure in the boiler by turning the
pressure switch with the screw(versions EMA-EPU)
2.
Replace the regulator with a smaller diameter one
1.
Adjust the grinding of the coffee
1.
Adjust the grinding of the coffee
2.
Replace the injector
3.
Control and clean the dispensing unit
4.
Clean or replace filters
1.
Clean the drain of the dispensing unit
2.
Wait until the complete heating of the group
3.
Adjust the grinding of the coffee
1.
Replace the pressure gauge
2.
Adjust the calibration of the motor pump
(versions EMA-EPU)
1.
Clean the filter holder
2.
Replace the filter
3.
Replace the grinders
4.
Replace the seal
5.
Decrease the temperature of the groups and/or
of water used for coffee preparation
1.
Check for proper connection of the volumetric
dosing device connector
2.
Check for proper connection of the 8-pin
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 check the
grinders, if necessary
6.
Check and replace the non-return valve, if
necessary
7.
Check and replace the drain valves, if necessary
8.
Clean and replace the solenoid valve, if necessary
9.
Clean or replace the volumetric dosing device
1.
Turn the machine off and then back on
2.
Open the water supply tap
3.
Check and replace the defective hoses
4.
Check and restore the connections
1.
Check the connection of the volumetric dosing
device
1.
Check the status of the pump and take any
corrective action which may be required
2.
Tighten the connections
3.
Tighten the hex connection of the pressure relief
valve and filter
4.
Replace the seal and O-Ring, taking care not to
change the calibration of the valve