7.7 FLOWMETER AND
NON-RETURN VALVE
(only version V)
For each group there is a flowmeter (known as
Ventolino).
The issues related to the flow meter are those that
can be found when dosing coffee, therefore only
when using the pre-set dosage buttons.
WHEN TO INTERVENE
The most common errors that you may encoun-
ter are:
1 Wires disconnected accidentally or uninten-
tionally (e.g. after replacing a card).
2 There are impurities in the filter at the
entrance of the fan.
3 The coil of the magnetic sensor has dete-
riorated and no longer reads the values cor-
rectly.
4 The non-return valve is blocked.
5 By pressing a button on one unit dispensing
begins on another unit or on multiple units
simultaneously.
7 Remove the valve assembly. At this point it is
possible to remove the electromagnetic coil
with a 14 mm key and the movable cylinder
with a 24 mm wrench.
8 If the valve is completely replaced, use
Teflon tape to ensure that the various joints
are perfectly sealed.
Edition 01 of 08/2017
7.10
SERVICE MANUAL
Fig. 211
Fig. 210
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