La San Marco TOP 85 Emploi Et Entretien page 71

PROBlEM
9.
• Overfill alarm
10. • The machine is switched
on (the main switch is in
position 1 or 2 and the
signal light is lit) but the
electronic control is out
of order.
11. • The machine feeds
water from one serving
unit although the serving
has not been selected.
12. • One unit serves water
continuously.
13. • The steamer discharges
only small quantities of
steam or water droplets.
14. • Some drops come out of
the dispensing spout.
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).
70
CAUSE
• Malfunction in automatic level
circuit.
• Leak in button for manual
water filling.
• Leak in heat exchangers.
• The electric wiring of the
electronic control unit is
defective.
• The electronic control unit is
defective.
• 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).
SOlUTION
• Check the hydraulic circuit of the
autolevel.
• Check the electrical wiring, the
electronic control unit and its
components.
• Replace the electronic control unit.
• 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 valve and
replace it if 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 (TOP 85 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.