18. Defects - Malfunctions
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PROBLEM
Infusion time too short
Rapid dispensing.
Coffee very bland, without cream.
(Same defects on all groups).
Infusion time very short.
Rapid dispensing.
Coffee very bland, without cream.
(Same defects on all groups).
Low coffee yield.
Slow dispensing.
Coffee cold and bland.
Fast dispensing, coffee bland.
Pressure gauge pump indicates pressure
greater than 9 bar.
Low coffee yield.
Fast dispensing.
Coffee hot and bland.
Coffee cold, bland and without cream.
Normal infusion and dispensing times.
Coffee cold in the morning at start of
work.
SOLUTION
This defect is associated to other
secondary symptoms which may be
caused by a number of other causes as
per the previous points. Do not adjust the
machine until all other causes have been
excluded.
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must be 100 cm³ in 8 ÷ 10 seconds.
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holder, thin, isolated jets will be dispensed
instead of one central jet.
Coffee grounds in cup.
Move group to and fro to remove air
bubble.
When touching the water tube it is warm
near to the machine.
Pressure gauge calibrated with values that
are too low.
See switching on instructions.
CAUSE
Coffee grounds too course.
Old coffee.
Group nozzle widened through use.
OR gasket in cone-shaped section leaks.
Infusion valve remains open
Filter edge broken.
Spout dirty.
Pump out of calibration.
By-pass valve blocked.
Filters with perforations widened.
Coarse grinding.
Air bubble in thermosiphon circulation.
Check valve does not hold (with low
pressure in system).
Heat exchangers emptied.
Heat exchanger defective (shows
pressures higher than real values).
Air in boiler.
18. Defects - Malfunctions
Direct action by the customer
Before calling service personnel, to avoid useless expense, check whether the machine problem corresponds to one of the cases
listed below.
PROBLEM
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10
).
Coffee dispensing time too short.
Coffee drips out of machine.
Loss of water under the machine.
SOLUTION
Clean using the special brush provided.
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Use new coffee.
Clean.
Use a coarser grind.
Clean.
Clean.
CAUSE
Underpan gasket dirty with coffee.
Coffee ground too coarse.
Coffee too old.
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(10
)
outlet hole dirty.
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Discharge well clogged up.
Discharge pan hole blocked.
33
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