Krups EF 472, Service Manual

Page: 15 / 42

Service Manual EF 472
15
T R O U B L E S H O O T I N G
4 Continuation
4.2 Continuation
YES ­ g) wiring is okay YES ­ replace the entire elec­
tronics
NO ­ replace defective cables
NO ­ continue with point 4.3
4.3 Capsule container
is illuminated
YES ­ continue with point 4.4
NO ­ replace mainboard
4.4 Both coffee buttons
are blinking 3x fast
YES ­ thermoblock is hot YES ­ replace NTC­tempera­
ture sensor
NO ­ replace thermoblock
NO ­ self test ok.
Continue with point 5
5 Measure coffee
temperature dur­
ing preparation
(see "Measuring
the coffee tem­
perature" on page
36)
5.1 No coffee
YES ­ a) water system is empty YES ­ for further procedures,
see "Filling the water system"
on page 9
NO ­ continue with the point b)
YES ­ b) flow meter blocked YES ­ clean or replace
NO ­ continue with point c)
YES ­ c) pyramide plate
blocked YES ­ replace the compact
brewing unit
NO ­ continue with point d)
YES ­ d) coffee machine is cal­
cified YES ­ descale coffee machine
(see "Descaling" on page 37)
NO ­ continue with point 5.2
5.2 Temperature is too
low (below 83°C)
YES ­ Descale coffee machine
(see "Descaling" on page 37)
NO ­ continue with point 5.3
5.3 Temperature too
high (over 89°C)
YES ­ replace NTC­tempera­
ture sensor
NO ­ continue with point 6
6 Check for leakage
and measure flow
rate (see "Meas­
ure flow rate" on
page 32 or "Pres­
sure and leakage
checks" on page
33)
6.1 CBU leaks
YES ­ replace the compact
brewing unit
NO ­ continue with point 6.2
6.2 Hose connections
leak
YES ­ replace defective hoses
and seals
NO ­ continue with point 6.3
6.3 Rate of flow not in
the standard range
YES ­ coffee machine is calci­
fied YES ­ descale coffee machine
(see "Descaling" on page 37)
NO ­ replace pump
NO ­ no errors found according
to checklist for more information please
contact
Nespresso Service
Division
7
Descale coffee
machine
(if necessary)
7.1 Coffee machine is
calcified
YES ­ Descale coffee machine
(see "Descaling" on page 37)
NO ­ continue with point 8
8 Final cleaning
(see "Daily main­
tenance, clean­
ing" on page 39)
End of check list
Check Error symptoms
Measure /
repair work
Further measures / repair
work