• Cafés Il Gondolero
  • Cafés Il Gondolero
  • Cafés Il Gondolero
  • Cafés Il Gondolero
  • Cafés Il Gondolero

EXAMPLES OF FAILURES AND POSSIBLE CAUSES IN A CONTINUOUS BREWING MACHINE

 

01

[problem]

Coffee flows too quickly.
Brewing time too short.
Coffee weak and not creamy (from all groups)

[possible causes]

Coffee ground too coarsely.
Coffee old.



[notes]

If other problems also exist, the cause may be different. Do not adjust grinder point until other possible causes have been eliminated.

02

[problem]

Coffee flows too quickly.
Brewing time too short.
Coffee weak and not creamy (from just one group)

[possible causes]

Group jet worn from use.
“O” ring in trunk cone leaking.
Infusion valve open.
Filter broken at edge.

[notes]

Group unfiltered flow should be 100 cm3 in 8-10”.


03

[problem]

Coffee hardly used.
Brewing slow.
Coffee cold and weak.


[possible causes]

Shower dirty.




[notes]

When the group is turned on without filter holder, rather than a central stream of water, what emerges are thin, isolated trickles.

04

[problem]

Brewing time too short, coffee weak.

[possible causes]

Pump set wrong.
Bypass valve blocked.

[notes]



05

[problem]

Coffee hardly used.
Brewing time too short, coffee hot and weak.

[possible causes]

Filters too thick.
Coffee ground too coarsely.

[notes]

Coffee dregs in cup.


06

[problem]

Coffee cold, weak and not creamy enough.
Infusion and brewing times normal.




[possible causes]

Air bubbles in thermosyphon.
Stop valve not working (with very low pressure in the grid).
Heat pipes broken, boiler pressure gauge broken (indicates higher pressure than real).


[notes]

Turn on the group two or three times to remove air. By touching the water input pipes you can see whether they are hot in places near the coffee maker. Pressure gauge and gas autolevel wrongly set due to low pressure levels.

07

[problem]

Coffee cold at in the morning when work begins.

[possible causes]

Air in boiler.

[notes]

See start-up instructions.

08

[problem]

Slow brewing.
Coffee burnt and cold.
Cream very dark, with tendency to form pores.

[possible causes]

Coffee ground too finely.
Low pressure in pump.
Filter over jet dirty or partially blocked.

[notes]





09

[problem]

Slow brewing, coffee burnt.

[possible causes]

Pump set wrongly.
Pump set at pressure too low.

[notes]



10

[problem]

Group resting leaking through drainage pipe (problem noted only in one group).
Coffee brewing normal.

[possible causes]

Brewing valve will not close.



[notes]





11

[problem]

Groups resting.
Brewing valve seal wears quickly.
Water leaking through drainage pipe.
Coffee brewing normal.
(Problem observed in all groups)

[possible causes]

Expansion valve set too high (over 10-11 Atmospheres).




[notes]







12

[problem]

Groups resting.
Constant water leakage from drainage pump.

[possible causes]

Expansion valve wrongly set or in poor condition.

[notes]




13

[problem]

Group operating.
Leakage in drainage pipe.
No coffee produced.

[possible causes]

Drainage valve will not close.


[notes]




14

[problem]

Group operating.
Cold water leaking from drainage pump.
Coffee week.
Slow brewing.

[possible causes]

Expansion valve set wrongly (opening at less than 9 Atmospheres).


[notes]






15

[problem]

Group leaking through eccentric axis.



[possible causes]

The two cylinder seals are worn.




[notes]

When removing seals, be careful not to scratch housing. Do not use steel tools or other hard materials. Before reassembling, clean axis, particularly the notch.

16

[problem]

Group operation defective.

[possible causes]

Profile of eccentric worn.

[notes]

 

17

[problem]

Coffee maker does not build pressure, or does so very slowly.
Exclusively electrical or mixed (gas-electric) operation.



[possible causes]

No electrical current.
Gas safety valve or main switch broken.
Resistance burnt.
Resistance in electrical circuit cut.
Not enough water in boiler.

[notes]

Steam nozzle leaking.
Particularly when the machine is left on at night, the resistance can become uncovered and burn out.
Sight glass dirty.
Lower level pipe blocked.

18

[problem]

Cups very hot.

[possible causes]

Minimum gas level very high.

[notes]

 

19

[problem]

Pump noisy.

[possible causes]

Pump defective.
Not enough water in system.
Water input blocked.

[notes]



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