Wega MININOVA Manual Del Usuario página 92

Indication
1) The electrical heating element is defective
2) The electrical connection is defective
3) Lime scale on heat exchanger and/or heating element
COFFEE IS TOO COLD
4) The pressure switch contacts are oxidized
5) The heating element protection thermostat has cut in
6) Lime scale has reduced the circulation of water
7) The delivery group is cold
1) The boiler temperature is too high
COFFEE IS TOO HOT
2) The flow reducer of the group is unsuitable
COFFEE DISPENSED
1) The coffee is ground too coarsely
TOO QUICKLY
1) The injector is clogged
COFFEE DISPENSED
2) The delivery group is clogged
TOO SLOWLY 3) The filter holder is dirty
4) Coffee is ground too finely
COFFEE GROUNDS
1) The group solenoid valve discharge is clogged
ARE WET 2) The delivery group is too cold
THE GAUGE SHOWS AN
1) The pressure gauge is defective
UNACCEPTABLE
2) Incorrect pressure switch calibration (versions EMA-EPU)
PRESSURE
1) The filter holder is dirty
GROUNDS IN CUP
2) The undercup seal is worn
1) The connection of the volumetric dosing device
is defective
2) The connection of the electronic control unit
for EVD :
is defective
INCORRECT
3) The connector of the volumetric dosing device has humidity
COFFEE DELIVERY
on it
4) The volumetric dosing device is defective: during delivery
THE COFFEE
the dosing device LED does not flash
DOSE IS NOT MET 5) The non-return valve loses pressure
(the dose is too small)
6) The drain valves lose pressure
THE LED OF THE DOSE
(the dose is too small)
BUTTON FLASHES
7) Water leakage from the group solenoid valve during coffee
delivery or when at rest
8) The volumetric dosing device is partially obstructed
90
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Cause
espresso coffee machine - technician instructions
Solution
1) Replace the electrical heating element
2) Check for any defective connections
3) Clean the machine
4) Clean the contacts or replace the pressure switch
5) Reset the heating element protection
6) Clean the connections of the exchanger, and clean or replace
the two circulation tubes
7) Eliminate air pockets in the hydraulic circuit in the following
manner:
- disconnect the electrical power supply to the pump
- close the mains water tap
- perform a dry delivery run for a few minutes
- reconnect the electrical power supply to the pump
- open the mains water tap
- perform delivery until water comes out
- wait a few minutes for heating
1) educe pressure in the boiler by turning the appropriate screw
on the pressure switch (versions EMA-EPU)
2) Replace the injector with one of a smaller diameter
1) Adjust the grinding of the coffee
1) Replace the injector
2) Check and clean the delivery group
3) Clean and replace the filter holders, if necessary
4) Adjust the grinding of the coffee
1) Clean the group drain
2) Wait for group to heat up completely
1) Replace the pressure gauge
2) Adjust the calibration of the pressure switch (versions EMA-EPU)
1) Clean the filter holder
2) Replace the seal
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) Check and replace the non-return valve,
if necessary
6) Check and replace the drain valves,
if necessary
7) Clean and replace the solenoid valve,
if necessary
8) Clean or replace the volumetric dosing device