Troubleshooting; Check List For Coffee Machine (All Models) - Nespresso EF 451 C 111 Service Manual

After an initial inspec-
tion in accordance
with this check list,
errors are quickly found and
corrected with the appropri-
ate measure.
Therefore, adhere to the
sequence of the check list.
Repair every occurring error
and work the check list
through until it is completed.
42
T R O U B L E S H O O T I N G
7 T R O U B L E S H O O T I N G
7.1

Check list for coffee machine (all models)

Check Error symptoms
1.1 Housing parts bro-
ken or damaged
1 Check the coffee
machine for visi-
ble damage
1.2 Power cord dam-
aged
2.1 Cup support does
not remain in verti-
cal position
2.2 Cup support rattles
when folded down
2 Check mechani-
2.3 Closing handle
cal components
malfunction
2.4 Closing handle -
unusual noise dur-
ing actuation
2.5 Capsule is not
ejected correctly
3 Fill water tank 3.1 Water tank leaks
4.1 Coffee machine is
not working
4 Activate Coffee
(does not function)
Machine to per-
form automatic
self test
4.2 Both coffee buttons
are blinking 3x fast
Citiz service manual
Measure /
repair work
YES - replace housing parts if
necessary
NO - continue
YES - replace power cord
NO - connect power cord of
machine to the mains and con-
tinue
YES - check if the capsule and
waste water container are cor-
rectly inserted and mounted
NO - continue
YES - check if 2 rubber stop-
pers are mounted on waste
water container
NO - continue
YES - it is very difficult or
almost impossible to close the
handle and to press it all the
way down
NO - continue
YES - check if damper is
mounted underneath closing
handle
NO - continue
YES - replace brewing unit
(TMBU)
NO - continue
YES - replace water tank
NO - continue
a) YES - power cord is okay
(loose connection)
b) YES - pump works (press a
coffee button)
c) YES- both cof f ee buttons are
working
d) YES- pump thermostat is
working
e) YES- fine wire fuse(s)
(167 °C) on thermoblock defec-
tive
f) YES - wiring is okay
NO - continue with point 4.3
YES - thermoblock is hot
NO - self test ok - continue
Further measures / repair
work
YES - replace damaged or
deformed capsule container
and/or waste water container.
NO - replace stoppers
YES - replace the compact
brewing unit
NO - replace damper
YES - continue
NO - replace power cord
YES - continue with point f)
NO - continue with point c)
YES - continue
NO - replace electronic control
board
YES - replace thermostat
NO - replace pump
YES - replace thermoblock and
if necessary replace electronic
control board
NO - continue
YES - replace electronic con-
trol board
NO - replace defective cables
YES - replace NTC tempera-
ture sensor
NO - replace thermoblock