espresso coffee machine - technician instructions
40
- english
R
THE PUMP WORKS ONLY
WITH THE MANUAL
DELIVERY BUTTON
Indication
Cause
Solution
1) The pump fuse of the electronic control unit is burned out
1) Replace the pump fuse of the electronic control unit (10 A)
SHUTDOWN OF THE
ELECTRONIC SYSTEM
1) The control unit fuse is burned out
2) The volumetric dosing device has a contact of the positive
pole to the earth
1) Replace the main fuse (125 mA)
2) Check the connection of the volumetric dosing device
THE PUMP LEAKS WATER
1) Poor mechanical seal of the shaft or the
O-ring seal
2) The inlet and outlet connections are loose
3) The hex nut of the pressure relief valve or the filter is
loose
4) The seal or O-ring of the pressure relief valve or the filter
is defective.
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
the filter
4) Replace the seal and O-ring. Take care not to change the
calibration of the valve
THE PUMP FUNCTIONS
BELOW NOMINAL CAPACITY
1) The inlet is clogged, perhaps only partially
2) The pump rotates in the wrong direction
3) The pressure relief valve is not properly calibrated
4) The motor runs at a low RPM
5) The inside of the pump is damaged due to the infiltration
of foreign matter
1) Clean the filter holder
2) Check the motor
3) Calibrate the pressure relief valve
4) Check the voltage or replace the motor
5) Replace the pump
1) The pump and the motor are not aligned
2) The seal or O-ring of the pressure relief valve or the filter
is defective.
3) The joint, the coupling screw or the V-shaped clamp is
loose.
4) The inlet is clogged, perhaps only partially
5) The hex nut of the pressure relief valve or the filter is
loose
1) Install the pump-motor joint
2) Replace the seal and O-ring. Take care not to change the calibra-
tion of the valve
3) Align and tighten the components which are
loose
4) Clean the inlet pump filter
5) Tighten the hex connection of the pressure relief valve and
the filter
THE MOTOR STOPS
SUDDENLY OR THE
THERMAL PROTECTOR
INTERVENES DUE TO
OVERLOAD
1) Lime scale and mineral build-ups in the pump have caused
it to jam
2) The pump and the motor are not aligned
3) The motor is defective
4) The motor is connected with a incorrect voltage
1) Check the status of the pump and replace it, if necessary
2) Install the pump-motor joint
3) Replace the motor
4) Ensure that the power supply voltage of the motor is correct
THE PUMP IS NOISY
1) Steam pockets in the delivery system
2) Air pockets in the hydraulic circuit
3) Coffee is ground too finely
4) The flow reducer of the group is not suitable
1) Reduce the water temperature
2) Check the cause and eliminate the problem
3) Adjust the grinding suitably
4) Replace the flow reducer
THE CUP IS DIRTY WITH
SPLASHED COFFEE
