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8.7 Malfunctions and solutions
Problem
NO
MACHINE POWER
NO WATER IN THE HEATING UNIT
TOO MUCH WATER IN THE HEAT-
ING UNIT
WATER IS LEAKING
FROM THE MACHINE
WATER IS LEAKING FROM THE
DISPENSING GROUP
THE GAUGE INDICATES A NON
-CONFORMING PRESSURE
THE SAFETY VALVE
IS IN OPERATION
NO STEAM RELEASED
FROM NOZZLE
WATER OR STEAM MIXED WITH
WATER
COMES OUT OF STEAM NOZZLES
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 de-
vice 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 de-
vice 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 in-
correctly.
• The motor pump has been calibrated incor-
rectly.
• 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 po-
sitioned inside the heating unit or the pres-
ence of limestone.
• The heating unit filling solenoid valve is leak-
ing.
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
transducer. Replace the safety valve with an
original spare part only.
• Check that the electronic system is working
properly.
• Turn on the machine.
• Replace the electrical heating element.
• Replace the temperature probe.
• Clean the steam nozzle sprayer.
• Reactivate or replace the thermostat.
• 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.
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