Nespresso EF 451 C 111, EF 452 D 111, EF 467 C 121, EF 468 D 121 Service Manual
SERVICE MANUAL
CITIZ REFRESH COFFEE MACHINES
Citiz EF 451 C 111
EF 452 D 111
Citiz & milk EF 467 C 121
EF 468 D 121
Version 1.0 en
Citiz service manual
2
CONTENTS
1 General Safety Notes ........................................................................................6
2 Model overview................................................................................................... 7
2.1 Model range ....................................................................................................... 7
2.2 Core unit versions .............................................................................................. 8
3 Main Components..............................................................................................9
3.1 Overview - core unit, D-range ............................................................................ 9
3.1.1 Interior view - core unit, D-range............................................................. 10
3.2 Overview - core unit, C-range .......................................................................... 11
3.2.1 Interior view - core unit, C-range............................................................. 12
3.3 Overview - model Citiz ..................................................................................... 13
3.4 Overview - model Citiz & milk .......................................................................... 14
3.4.1 Overview - milk frother AERO3............................................................... 15
3.5 Fluid System .................................................................................................... 16
3.5.1 Water circuit diagram of core unit (all Citiz versions) .............................. 16
3.5.2 Water circuit of models Citiz/Citiz & milk................................................. 17
4 Technical Data...................................................................................................18
4.1 Rating plates .................................................................................................... 18
4.1.1 Examples of brand specific rating plates ................................................18
4.1.2 Rating plate details ................................................................................. 21
4.1.3 Rating plate of milk frother (EUR-Version model Citiz & milk) ................22
4.1.4 Rating plate of milk frother (USA-Version model Citiz & milk) ................22
4.2 Summary of technical data............................................................................... 23
4.2.1 Technical data of coffee machines.......................................................... 23
4.2.2 Technical data of milk frother (model Citiz & milk) ..................................24
4.2.3 Dimensions and weight - model Citiz...................................................... 25
4.2.4 Dimensions and weight - model Citiz & milk ........................................... 26
4.2.5 Dimensions and weight - milk frother...................................................... 26
5 Operation............................................................................................................27
5.1 General information.......................................................................................... 27
5.2 Status indication............................................................................................... 27
5.2.1 Status indication of coffee machine ........................................................ 27
5.2.2 Status indication of milk frother AERO3..................................................29
5.3 Machine modes................................................................................................ 30
5.3.1 Machine modes of Citiz coffee machines ............................................... 30
5.3.2 Machine modes of milk frother AERO3................................................... 31
5.4 Program/reset fill up level................................................................................. 32
5.4.1 Programming the fill up level...................................................................32
5.4.2 Resetting the fill up level ......................................................................... 33
5.5 Empty water system......................................................................................... 34
6 Maintenance...................................................................................................... 35
6.1 Daily maintenance and cleaning ...................................................................... 35
6.1.1 Before first coffee or at the start of day................................................... 35
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6.1.2 Milk preparation ...................................................................................... 36
6.1.3 At the end of repair ................................................................................. 37
6.1.4 Milk frother of model Citiz & milk ............................................................ 38
6.2 Descaling ......................................................................................................... 39
6.2.1 Descaling procedure for models Citiz and Citiz & milk ........................... 39
7 Troubleshooting............................................................................................... 42
7.1 Check list for coffee machine (all models) ....................................................... 42
7.2 Check list for milk frother ................................................................................. 44
8Repairs................................................................................................................ 45
8.1 Safety instructions ........................................................................................... 45
8.2 Repair and mounting tips ................................................................................. 45
8.3 Tools and accessories ..................................................................................... 47
8.4 Platform disassembly - model Citiz.................................................................. 48
8.4.1 General disassembly .............................................................................. 48
8.4.2 Replacing water tank connector ............................................................. 51
8.4.3 Replacing power cord ............................................................................. 53
8.4.4 Removing core unit................................................................................. 55
8.5 Platform disassembly - model Citiz & milk ....................................................... 58
8.5.1 General disassembly .............................................................................. 58
8.5.2 Replacing water tank connector ............................................................. 62
8.5.3 Replacing milk frother connector ............................................................ 64
8.5.4 Replacing power cord ............................................................................. 65
8.5.5 Removing core unit................................................................................. 67
8.6 Disassembly of core unit, C-range................................................................... 70
8.6.1 General disassembly .............................................................................. 70
8.6.2 Replacing compact brewing unit............................................................. 75
8.6.3 Replacing pump...................................................................................... 77
8.6.4 Replacing flow meter .............................................................................. 80
8.6.5 Replacing automatic priming device (APD) ............................................ 81
8.6.6 Replacing thermoblock with NTC sensor and fine wire fuse(s) .............. 83
8.6.7 Replacing electronic control board with button prints ............................. 86
8.7 Disassembly of core unit, D-range................................................................... 88
8.7.1 General disassembly .............................................................................. 88
8.7.2 Replacing electronic control board with button prints ............................. 95
8.8 Wiring diagrams ............................................................................................... 97
8.8.1 Wiring diagrams - model Citiz................................................................. 97
9 Function tests................................................................................................. 101
9.1 Safety instructions ......................................................................................... 101
9.2 Required equipment ...................................................................................... 101
9.2.1 Overview............................................................................................... 101
9.2.2 Citiz pressure gauge adapter ............................................................... 102
9.3 Measure flow rate .......................................................................................... 103
9.4 Pressure and leakage checks........................................................................ 104
9.4.1 Preparations ......................................................................................... 105
9.4.2 Test run................................................................................................. 106
9.5 Measure coffee temperature.......................................................................... 107
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9.6 Milk frother tests............................................................................................. 109
9.6.1 Measure hot milk temperature ..............................................................109
9.6.2 Measure milk froth ratio ........................................................................ 109
9.7 Protective earth (PE) continuity test............................................................... 110
9.7.1 What coffee machine has to be tested and when? ............................... 110
9.7.2 General ................................................................................................. 110
9.7.3 Test sequence....................................................................................... 111
9.7.4 What to do if the protective earth continuity test fails............................ 112
9.8 Protective insulation test ................................................................................ 113
9.8.1 What coffee machines have to be tested and when? ........................... 113
9.8.2 General ................................................................................................. 113
9.8.3 Test sequence....................................................................................... 114
9.8.4 What to do if the insulation test fails ..................................................... 116
10 Explosion Drawings ...................................................................................... 117
10.1 Model Citiz EF 451 C111................................................................................ 117
10.2 Parts List EF 451 C111................................................................................... 119
10.3 Model Citiz EF 452 D111................................................................................ 121
10.4 Parts List EF 452 D111................................................................................... 123
10.5 Model Citiz EF 467 C121 ............................................................................... 125
10.6 Parts List EF 467 C121 .................................................................................. 127
10.7 Model Citiz EF 468 D121 ............................................................................... 129
10.8 Parts List EF 468 D121 .................................................................................. 131
Citiz service manual
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PREFACE
The purpose of this service manual is to provide the service personnel with all necessary
information with regards to correct handling, maintenance and repair of the Citiz coffee
machine types EF 451 C 111 / EF 452 D 111 and EF 467 C121 / EF 468 D 121.
This manual should be used by the technicians as a valuable aid to guarantee the
permanent readiness for use of the machines. In order to take full advantage of all the
functions, it is absolutely necessary to follow the instructions in this manual.
For fast access to information directly from the PC or MAC monitor, this service manual
is available as PDF file and can be downloaded from the Nespresso technical website
under https://business.nespresso.com.
The required utility software to read PDF files (Adobe Reader
®
) for PCs and MAC
computers can be downloaded (under http://www.adobe.com) for free - please click the
logo:
CONTENT UPDATES
Version 1.0
• First released service manual version in English.
Please keep this
manual together with
the corresponding
service documentation.
This way you are assured
to have the necessary
information.
The version number
of this service manual
is printed on the lower
right corner of the front
page.
Citiz service manual
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GENERAL SAFETY NOTES
1 GENERAL SAFETY NOTES
As an additional safety measure, the use of a residual current device (RCD), also called
the ground fault circuit interrupter (GFCI), in the repair centre is highly recommended.
Risk of fatal electrical shock and fire!
Mains voltage inside the coffee machine.
• Unplug appliance before cleaning.
• Never clean wet or immerse plug, cord or appliance in any fluid.
• Disconnect the mains plug before disassembly - the appliance must
be free of voltage.
This device does
not protect against
electrical shock due
to contact with both circuit conductors.
Example illustrations
of typical devices.
Use a GFCI with a trip
level of 4 - 6 mA (USA)
resp. a RCD with a trip
level of 15 - 30 mA (Europe).
A trip level above 30 mA
provides only very limited
protection against harm
from an electric shock.
1) RCD protected socket-outlet
2) Plug-in RCD unit
3) GFCI socket
4) Plug-in GFCI
Danger of burns!
Hot parts and water under pressure inside the coffee machine
(particularly in the thermoblock).
• Let coffee machine cool down before cleaning or disassembly.
1
2
RESET
TEST
RESET
TEST
3
4
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MODEL OVERVIEW
2 MODEL OVERVIEW
2.1 Model range
With core unit D-range: With core unit C-range:
Each model
- has a special platform
- is available in 2 different designs, depending on the core unit version (C- or D-range).
1) Citiz
2) Citiz & milk
1
2
EF 452 D111
EF 468 D121
EF 451 C111
EF 467 C121
A core unit is the
actual coffee
machine, mounted on
a platform.
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MODEL OVERVIEW
2.2 Core unit versions
D-range C-range
This comparison
helps to identify the
core unit version.
1) Coffee outlet
2) Closing handle
3) Coffee buttons
4) Cup holder
1
1
2
2
3
3
4
4
There are additional
differences between
the 2 versions (covers, wiring etc.) not mentioned in the table.
Different components D-range C-range
Coffee outlet (1) contured coffee outlet "flat" coffee outlet
Closing handle (2) chromium-plated closing handle black closing handle
Coffee buttons (3)
arranged on both sides of the
closing handle
arranged behind the closing
handle
Cup holder (4) cup holder with slotted recesses cup holder with circular recesses
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MAIN COMPONENTS
3 MAIN COMPONENTS
3.1 Overview - core unit, D-range
For platform components refer to model
overview.
1) Cup support
2) Waste water container
3) Capsule container (used capsules)
4) Coffee nozzle
5) Steam cover
6) Closing handle
7) Espresso button
8) Lungo button
9) Side panels left/right
10) Rear cover
3
9
7
5
1
2
6
4
8
10
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MAIN COMPONENTS
3.1.1 Interior view - core unit, D-range
1) Button prints
2) Capsule bay
3) Brewing unit (TMBU, Tolkien Mini
Brewing Unit)
4) Pump (Sysko)
5) Flowmeter (FHKSC12)
6) Electronic control board
(with protective covers)
7) Self priming device (APD)
8) NTC temperature sensor
9) Thermoblock (EF 2003)
1
2
6
4
5
3
9
7
8
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MAIN COMPONENTS
3.2 Overview - core unit, C-range
1) Cup support
2) Waste water container
3) Capsule container (used capsules)
4) Side panel, left
5) Side panel, right
6) Coffee nozzle
7) Steam cover
8) Closing handle
9) Espresso button
10) Lungo button
11) Top cover
12) Rear cover
3
9
7
8
6
10
12
11
4
5
1
2
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MAIN COMPONENTS
3.2.1 Interior view - core unit, C-range
1) Capsule bay
2) Brewing unit (TMBU, Tolkien Mini
Brewing Unit)
3) Button prints (under top cover)
4) Pump (Sysko)
5) Flowmeter (FHKSC12)
6) Electronic control board
(with protective covers)
7) Self priming device (APD)
8) NTC temperature sensor
9) Thermoblock (EF 2003)
3
1
6
4
5
2
9
7
8
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MAIN COMPONENTS
3.3 Overview - model Citiz
This is the basic model with the smallest platform (8).
The drip grid (1)
- exists in 2 versions,
- matches with the cup holder of the core unit version (e.g. circular recesses).
This model is pictured
with a C-range core
unit.
1) Drip grid
2) Drip tray
3) Core unit (e.g. C-range)
4) Water tank cover
5) Water tank
6) Water tank connector
7) Power cord
8) Platform
4
5
1
8
2
7
3
6
The core units of
model Citiz and Citiz
& milk are not compatible due to different
electronic control boards.
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MAIN COMPONENTS
3.4 Overview - model Citiz & milk
The platform of this model is equipped with a milk frother (8).
The drip grid (1)
- exists in 2 versions,
- matches with the cup holder of the core unit version (e.g. circular recesses).
This model is pictured
with a C-range core
unit.
1) Drip grid
2) Drip tray
3) Platform
4) Storage places for whisks
5) Core unit (e.g. C-range)
6) Water tank
7) Water tank cover
8) Milk frother (Aero 3)
9) Lid
10) Milk frother start button
11) Water tank connector
12) Power cord
13) Milk frother connector
14) Cup storage (removable)
6
1
13
2
12
14
7
9
5
8
11
4
10
3
The core units of
model Citiz and Citiz
& milk are not compatible due to different
electronic control boards.
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MAIN COMPONENTS
3.4.1 Overview - milk frother AERO3
The inside of the jug (3)
- has level marks,
- is surface-coated for easy cleaning.
The milk frother
AERO3 is part of the
standard equipment
of the model Citiz & milk.
1) Lid
2) Seal
3) Jug
4) Start button (red/blue backlighted)
5) Mixer for hot milk
6) Spring whisk for milk foam
1
2
3
4
6
5
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MAIN COMPONENTS
3.5 Fluid System
3.5.1 Water circuit diagram of core unit (all Citiz versions)
Legend:
The self priming device (4)
- allows the pump to suck water when it is filled with air (new machine, empty water
tank etc.)
- removes air bubbles from the water circuit
- feeds a water/air mix back into the water tank.
1) Water tank
2) Flow meter
3) Pump
4) Self priming device
5) Thermoblock
6) Mini brewing unit (MBU)
7) Capsule container
8) Waste water container
9) Drip tray
Fresh cold water
Fresh hot water
Coffee
Waste/drip water
Platform
Core unit
APD
TB
MBU
1
3
2
4
5
6
7
8
9
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MAIN COMPONENTS
3.5.2 Water circuit of models Citiz/Citiz & milk
1) Water tank
2) Water tank connector
3) APD
4) Thermoblock
5) Flowmeter
6) Outlet
7) Mini brewing unit (MBU)
1
2
3
4
6
5
7
8
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TECHNICAL DATA
4 TECHNICAL DATA
4.1 Rating plates
4.1.1 Examples of brand specific rating plates
Nespresso, EU-version
1) Water tank
2) Water tank connector
3) Self priming device
4) Thermoblock
5) Flow meter
6) Coffee outlet
7) Brewing unit
8) Pump
The type plate can be
found at the bottom of
the coffee machine’s
platform.
This overview shows
examples of various
brands and is subject
to alterations.
EF451 Citiz C111 titan EF452 Citiz D111 black
EF467 Citiz & milk C121 titan EF467 Citiz & milk D121 black
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TECHNICAL DATA
Rating plates Citiz machine partners
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TECHNICAL DATA
Rating plates Citiz & milk machine partners
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TECHNICAL DATA
4.1.2 Rating plate details
Decoding the alphanumeric serial number
Example:
1) Brand name
2) Voltage and power rating
3) Place of manufacture
4) National approval sign of Germany
(VDE), conform with RoHS guidelines
(lead free solder, etc.)
5) Barcode
6) Serial number
7) Machine type
8) National approval sign of Russia
(GOST R)
9) Special disposal icon
(do not dispose with ordinary waste)(
10) Sign of conformity (CE)
11) Article number of the rating plate
1
2
3
4
6
5
7
10
11
9
8
By decoding the date
of production and
machine type, the
coffee machine can be
identified exactly.
Checksum (if available)
Colour version
Type of mains plug
Mains voltage
Distributing partner
Incremental number per production day
Manufacturing plant
Manufacturer designation of the machine type (EF 451)
12178 ... Date of production
(12 = year 2012, 178 = 178
th
day of the year)
121 784 51b 1234 782 04 d
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TECHNICAL DATA
4.1.3 Rating plate of milk frother (EUR-Version model
Citiz & milk)
4.1.4 Rating plate of milk frother (USA-Version model
Citiz & milk)
Note he mains voltage ranges of the different models.
Note he mains voltage ranges of the different models.
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TECHNICAL DATA
4.2 Summary of technical data
4.2.1 Technical data of coffee machines
Mains voltage ranges
EU, RU, AU ................................................................................. 220-240 V / 50-60 Hz
US, CA ......................................................................................... 120-127 V / 50-60 Hz
Approvals .................................................................................. CE, Gost R, Ctick, UL
Power ratings of coffee machine main components
(for all voltages and frequencies)
Thermoblock ...................................................................................................... 1200 W
Pump................................................................................................................. 55/65 W
Ratings
Energy efficiency class level for Citiz, Citiz & milk .............................................A - 40%
Daily energy consumption Citiz......................................................................... 73.7 Wh
Daily energy consumption Citiz & milk .............................................................. 75.6 Wh
Annual energy consumption Citiz.................................................................... 26.9 kWh
Annual energy consumption Citiz & milk......................................................... 27.6 kWh
Pump
Pump pressure
- Max. permissible .............................................................................. 17.5 bar ± 1.5 bar
- During coffee preparation (depending on the type of coffee).......................... 9-16 bar
Flow performance ..................................................................120-240 ml/min. at 12 bar
Capacities
Water tank
- Citiz........................................................................................................................1.0 l
- Citiz & milk .............................................................................................................1.0 l
Drip tray
- Citiz.................................................................................................................... 100 ml
- Citiz & milk .........................................................................................................180 ml
Capsule container
- Citiz, Citiz & milk .....................................................................................9-11 capsules
Technical data are
valid for all Citiz models unless explicitly
stated otherwise.
Advised water tank
capacities to avoid
spilling.
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TECHNICAL DATA
Temperatures
Operating temperature ................................................................... + 5 °C up to + 45 °C
Storage temperature...................................................................... - 25 °C up to + 60 °C
Safety temperature (thermal cut-off) ................................................................... 167 °C
Coffee temperature at outlet....................................................................... 86 °C ± 3 °C
Various data
Preheating time .......................................................................................approx. 25 sec
Cable length .............................................................................................. approx. 1.0m
4.2.2 Technical data of milk frother (model Citiz & milk)
Mains voltage
EU ............................................................................................... 220-240 V / 50-60 Hz
US/CA .......................................................................................... 120-127 V / 50-60 Hz
The milk frother
- is available in 2 different models, depending on above mains voltage ranges,
- has to match the mains voltage range of the associated coffee machine.
Capacity
Hot milk ...................................................................................................... max. 240 ml
Hot/cold milk for milk froth ...........................................................................max. 130 ml
Performance data
Preparation times
(with full, semi-skimmed or skimmed milk at 8 °-10 °C fridge temperature)
Hot milk froth (120 ml) .....................................................................................50-80 sec
Cold milk froth (120 ml) ...................................................................................60-80 sec
Hot milk (240 ml) .........................................................................................120-180 sec
Temperature
Hot milk ............................................................................................. + 60 °C to + 70 °C
Foam milk.......................................................................................... + 60 °C to + 70 °C
If replacing a defect
milk frother, check
mains voltage range.
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TECHNICAL DATA
4.2.3 Dimensions and weight - model Citiz
Dimensions (width x height x length) ............................................ 130 x 277 x 372 mm
Cup support down ...............................85-90 mm, for espresso and lungo cups/glasses
Cup support up ...................................................... 150-155 mm, for macchiato glasses
Weight (without water) ............................................................................. approx. 3.4 kg
The overall dimensions are the same
for both core unit ver-
sions (C- and D-range).
Dimensions in mm
89
98
372
130
361
230
277
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TECHNICAL DATA
4.2.4 Dimensions and weight - model Citiz & milk
Dimensions (width x height x length)............................................. 237 x 277 x 372 mm
Weight (without water, milk frother included)............................................approx. 4.6 kg
4.2.5 Dimensions and weight - milk frother
Dimensions of jug cpl. (diameter x height) ................................................ 91 x 170 mm
Whisk for foam (diameter x height) ..............................................................33 x 32 mm
Mixer for hot milk ..................................................................................15 x 34 x 32 mm
Weight (with whisk and mixer)...............................................................................0.7 kg
The overall dimensions are the same
for both core unit ver-
sions (C- and D-range).
Dimensions in mm
361
89
97.5
237372
231
277
Ø91
170
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OPERATION
5 OPERATION
5.1 General information
For an overview of operational controls see “Main Components” on page 9.
For basic operation of the machine such as preparing a coffee and other related infor-
mation, refer to the user manual.
To simplify matters, the model Citiz with core unit C-range is used to exemplify throughout
this chapter.
5.2 Status indication
5.2.1 Status indication of coffee machine
The two coffee buttons with green LED backlight show the status of the coffee machine
according to the following table:
Operating mode Small cup
Led
signal
Big cup
LED
signal
Off Off Off
Ready On On
Error
Blinking fast 3 times
every 2 sec.
Blinking fast 3 times
every 2 sec
Heat up
Blinking slow 1 Hz,
0.25sec on / 0.5sec off
Blinking slow 1 Hz,
0.25sec on / 0.5sec off
Brewing small cup
Brewing big cup
Blinking slow 1 Hz,
0.25sec on / 0.5sec off
On
On
Blinking slow 1 Hz,
0.25sec on / 0.5sec off
Rinse small cup
Rinse big cup
Blinking slow 1 Hz,
0.25sec on / 0.5sec off
On
On
Blinking slow 1 Hz,
0.25sec on / 0.5sec off
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OPERATION
Operating mode Small cup
Led
signal
Big cup
LED
signal
Power off Program
Blinking small cup 2 Hz
in 2sec frame
- 1x for 9 min.
(factory setting)
- 2 x for 30 min.
- 3 x for deactivated
Off
Emptying
Blinking fast 2 Hz,
0.25sec on / 0.5sec off
Off
Off
Blinking fast 2 Hz,
0.25sec on / 0.5sec off
Descaling ready
D. pump on (descal.)
D. pump off (descal.)
Blinking fast 2 Hz,
0.25sec on / 0.5sec of
Blinking fast 2 Hz,
0.25sec on / 0.5sec of
Overheat
Blinking slow 1 Hz,
0.25sec on / 0.5sec off
Blinking slow 1 Hz,
0.25sec on / 0.5sec off
Order small cup (during
heat)
Order big cup (during heat)
Blinking slow 1 Hz,
0.25sec on / 0.5sec off
off
Off
Blinking slow 1 Hz,
0.25sec on / 0.5sec off
No more stand by
No more power save
--
Resetting to factory Blinking 3 Hz Blinking 3 Hz
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OPERATION
5.2.2 Status indication of milk frother AERO3
The operating button with red/blue backlight shows the status of the milk frother
according to the following table:
To reset a red blinking
backlight:
1. Remove milk frother from
platform.
2. Remove cause of failure if
possible.
Machine status etc. Operating button Light signal
Off Backlight off
On - hot milk preparation Red backlight on
On - cold milk froth preparation
Blue backlight on
Failure/malfunction
(e.g. overheating because of
burnt milk, too less or no
milk)
Blinking red backlight
(1 Hz, 0.5sec on, 0.5sec off)
Failure: milk frother has
wrong mains voltage range
Fast blinking red backlight
(2 Hz, 0.25sec on, 0.25sec off
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OPERATION
5.3 Machine modes
5.3.1 Machine modes of Citiz coffee machines
This table helps to understand the operating modes of a Citiz coffee machine:
Machine mode Enter mode Actions Exit mode
1 Heat up mode
Every time after start
the machine
Heats up thermoblock
to ready temperature
90 °C within 60 s without overshooting target
temperature
2 Self test mode
Every time after start
the machine
Tests:
• NTC short circuit
• NTC connected
• Thermoblock hea ting
curve
Error handling:
Tracking of the last 5
errors by a ring buffer
3 Ready mode
• After heat up and self
test mode was ok
• After brewing or
volume brewing
coffee
• After reset mode
• After leaving
descaling mode
Keeps thermoblock
temperature at 90 °C
4a Brewing mode
4b Volume brewing
mode (programming cup size)
• Press and release
lungo or espresso
button (brewing
mode)
• Press and hold lungo
or espresso button
for more than 3 sec
(programming mode)
• Press and release
lungo or espresso
button when
machine was in
brewing mode or
automatic exit given
by the flow meter
• Release lungo or
espresso button
when machine was
in programming
mode
5 Descaling mode
• Start machine, wait
until ready
• Press and hold both
coffee buttons for at
least 3 s
• Regulate temperature to 65 °C (after
pump was started)
• Stop and start pump
with any coffee
button, no volume
brewing in descaling
mode
• Press and hold both
coffee buttons for at
least 3 s
Note:
When machine is
switched off during any
descaling mode, then it
goes to descaling
mode ready state after
next start.
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