Malfunctions And Solutions - Wega ALE Use And Maintenance Manual

7.6 Malfunctions and solutions

Problem
NO MACHINE POWER
NO WATER IN THE
HEATING UNIT
TOO MUCH WATER IN
THE HEATING UNIT
WATER LEAKS FROM
THE MACHINE
WATER LEAKS FROM THE
DISPENSING GROUP
THE GAUGE INDICATES
A NON-CONFORMING
PRESSURE
THE SAFETY VALVE
HAS CUT-IN
STEAM DOES NOT COME
OUT OF THE NOZZLES
WATER OR STEAM MIXED
WITH WATER COMES OUT
OF THE STEAM NOZZLES
NO COFFEE IS DISPENSING
TECHNICIANS' manual
Cause
• The general switch is in the "OFF" position.
• The machine switch is faulty.
• The mains switch is in the OFF position.
• The wiring is defective.
• The water mains valve is shut off.
• The cut-off valve of the automatic level device
is closed.
• The pump filter is clogged.
• The motor pump is disconnected or jammed.
• The water filling solenoid valve is faulty.
• The water inlet solenoid valve filter is clogged.
• The solenoid valve of the automatic level device
is faulty.
• The level probe is out of order (clogged by
lime-scale).
• The tray is not draining.
• The drain pipe is broken, has detached, or the
water flow is obstructed.
• Water is leaking from the hydraulic circuit.
• The group gasket is worn.
• The pressure gauge is faulty.
• The pressure switch has been calibrated incorrectly.
• The motor pump has been calibrated incorrectly.
• The pressure transducer is broken.
• The electronic control unit is faulty.
• The machine is switched off.
• The electrical heating element is faulty.
• The temperature probe is faulty.
• The nozzle sprayer is clogged.
• The safety thermostat is deactivated or faulty.
• The level of the heating unit is too high due to
the level probe being incorrectly positioned inside
the heating unit or the presence of limestone.
• The heating unit filling solenoid valve is leaking.
• There is no water in the mains.
• The group solenoid valve is faulty.
• The pump is jammed.
• The group solenoid valve is clogged or dirty.
• The group filter is clogged.
• The volumetric dosing device is jammed.
• The inlet and outlet valves of the dosing device
are closed.
Action
• Place the main switch in the "ON" position.
• Replace the main switch.
• Turn the mains switch to the ON position.
• Check for any faulty connections.
• Open the water mains valve.
• Open the automatic level device valve.
• Replace the pump filter.
• Check the motor pump.
• Replace the water filling solenoid valve.
• Clean or replace the solenoid valve filter.
• Replace the solenoid valve of the automatic level
device.
• Replace the level probe.
• Check the sewer drain.
• Check and restore the drain pipe connection to the
tray.
• Restore the hydraulic seal by replacing the pipe, the
gasket or the fitting as necessary.
• Replace the group gasket.
• Replace the pressure gauge.
• Adjust the pressure switch calibration.
• Adjust the motor pump calibration.
• Check for correct operation of the pressure trans-
ducer. Replace the safety valve with an original
spare part only.
• Check that the electronic system is working prop-
erly.
• Turn on the machine.
• Replace the electrical heating element.
• Replace the temperature probe.
• Clean the steam nozzle sprayer.
• Reactivate the thermostat or replace it.
• Check the condition of the level probe: check if it
is positioned correctly and check for any surface
lime-scale.
• Clean and replace the filling solenoid valve.
• Check that there is water in the mains.
• Replace the group solenoid valve.
• Replace the pump.
• Clean or replace the solenoid valve.
• Clean or replace the filter.
• Check/replace the dosing device.
• Open the valves.
47 100
of