La San Marco NEW 105 E Manual De Uso página 44

PRoBlEM
11. • The machine feeds
water from one serving
unit although the serving
has not been selected.
12. • 1 05 S models one
unit serves water
continuously.
13. • The steamer discharges
only small quantities of
steam or water droplets.
14. • Small drops flow out of
the water tap.
15. • The unit emits a whistle
after serving the coffee.
16. • The filter cup comes off
the serving unit.
17. • When coffee is being
served, some of it drips
out of the edge of the
filter cup.
18. • Water leaking from the
drain of the serving unit
solenoid.
19. • Light cream (the coffee
flows out of the spout
rapidly).
20. • Dark cream (the coffee
drips out of the spout).
CaUSE
• Solenoid and/or pump fed
continuously.
• electric circuit of unit
improperly connected.
• Tap needs adjustment.
• Worn gasket on tap.
• Leak in solenoid valve.
• Faulty operation of expansion
valve.
• High pump pressure.
• Worn gasket under the filter
cup.
• gasket under holder is worn.
• Malfunctioning unit solenoid.
• Water leaking from unit
cooling system.
• Coarse grinding.
• Low pressing pressure.
• Small quantity of ground
coffee.
• Water temperature below
90°C
• Pump pressure above 9 bar.
• Sprinkler filter on unit clogged.
• Filter holes widened (filter
cup).
• Fine grinding.
• High pressing pressure.
• Large quantity of ground
coffee.
• excessive temperature.
• Pump pressure below 9 bar.
• Sprinkler filter on unit clogged.
• Filter holes clogged (filter
cup).
SolUtion
• Control unit relay powered
continuously.
• Replace the electronic control unit.
• Check the connection and correct it
(see wiring diagram).
• Adjust tap.
• Replace the gasket.
• Check the solenoid valves (hot
and cold water) and replace as
necessary.
• Check the expansion valve and if
necessary replace it. Calibrate the
valve at 12 bar.
• Check the pump operating pressure.
Calibrate the pump at 9 bar.
• Replace gasket.
• Clean the serving unit and the filter
cup.
• Replace the gasket.
• Clean the serving unit and the filter
cup.
• Check the unit solenoid. Check the
plunger on the solenoid and clean
the solenoid.
• Replace the automatic level solenoid
valve.
• Check the small cooling tube and
the related seals of the serving
group (NeW 105 DTC).
• Finer grinding.
• Increase the pressure.
• Increase the quantity of ground
coffee.
• Adjust valve (flow variator) of
the group to a higher number or
increase boiler pressure.
• Decrease the pump pressure.
• Check and clean with blind filter or
replace.
• Check and replace filter.
• Coarser grinding.
• Reduce the pressure.
• Decrease the quantity of ground
coffee.
• Adjust valve (flow variator) of
the group to a lower number or
decrease boiler pressure.
• Increase the pump pressure.
• Check and clean the solid filter or
replace.
• Check and replace filter.
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