Nespresso EF 451 C 111 Service Manual page 43

Check Error symptoms
5.1 No coffee
5 Measure coffee
temperature dur-
ing preparation
(see page 107)
5.2 Temperature is too
low (below 83°C)
5.3 Temperature too
high (over 89 °C)
6.1 Compact brewing
unit leaks
6 Check for leakage
(see page 104)
6.2 Hose connections
and measure flow
leak
rate (see page
103)
6.3 Rate of flow not in
the standard range
7 Descale coffee
7.1 Coffee machine is
machine
calcified
(if necessary)
8 Final cleaning
(see page 35)
T R O U B L E S H O O T I N G
Measure /
repair work
YES - a) water system is empty YES - replace self priming
YES - b) flow meter blocked
YES - c) pyramid plate clocked YES - replace the compact
YES - d) coffee machine is cal-
cified
NO - continue
YES - descale coffee machine
(see page 39)
NO - continue
YES - replace NTC tempera-
ture sensor
NO - continue
YES - replace compact brew-
ing unit
NO - continue
YES - replace defective hoses
and seals
NO - continue
YES - coffee machine is calci-
fied
NO - continue with point 9
YES - descale coffee machine
(see page 39)
NO - continue with point 9
No errors found according to
check list?
End of check list
Further measures / repair
work
device (APD)
NO - continue
YES - clean or replace
NO - continue
brewing unit
NO - continue
YES - descale coffee machine
(see page 39)
YES - descale coffee machine
(see page 39)
NO - replace pump
YES - for more information
please contact Nespresso
Service Division
Citiz service manual
43