Indesit P0055 User manual

TECHNICAL MANUAL
COFFEE MACHINE
TECHNICAL MANUAL
COFFEE MACHINE
En
All the parts included in this document are the property of Indesit Company S.p.A.
All rights reserved. This document and the information it contains are supplied without liability for possible
errors or omissions; no part of this document can be reproduced, used or disclosed without written
permission or without being authorised by the terms of a contract clause.
Service Manual
P0055 Coffee Machine - 2006
Edition
2006.08.28
Language
English

En
2
Service Manual
P0055 Coffee Machine - 2006
Edition
2006.08.28
Language
English
CONTENTS OF THIS MANUAL: NOTE FOR THE SERVICE ENGINEER.
This manual is a supporting document for technical personnel. It contains a description of the various
product types, the general operating principle, and indications concerning assistance.
Technical personnel should anyway consult the specific model on .
(www.servicenet.indesitcompany.com) to access data and updates of electrical diagrams, technical
bulletins, and spare parts.

En
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Service Manual
P0055 Coffee Machine - 2006
Edition
2006.08.28
Language
English
CONTENTS
1. GENERAL INFORMATION 4-7
PRODUCT KEY 4
OVERVIEW 4
INTERFACE 5
GENERAL INFORMATION 5
TECHNICAL DATA 6
2. OPERATING LOGIC 7-13
OPERATING MODES 7
USER PROGRAMMING MODE 7
GROUND COFFEE DOSAGES 7
FACTORY SETTINGS 8
WATER CIRCUIT FUNCTIONAL DIAGRAM 9
SBS DELIVERY VALVE 10
AQUA PRIMA 12
3. COMPONENTS 14
INTERNAL COMPONENTS 14
4. ELECTRICAL DIAGRAMS 15
WIRING DIAGRAM 15
5. ASSISTANCE 16-35
DIAGNOSTICS MODE 16
TEST MODE 17
REMOVING THE OUTER CHASSIS 21
REMOVING THE CASE AND COMPONENTS SUPPORT 23
DISASSEMBLING THE COFFEE MACHINE 26
REMOVING THE BOILERS 31
CHANGING THE GEARMOTOR 33
TROUBLESHOOTING 35
6. EXPLODED VIEWS 36-41
7. APPENDIX 42
WATER CIRCUIT DIAGRAM 42

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Service Manual
P0055 Coffee Machine - 2006
Edition
2006.08.28
Language
English
1. PRODUCT TYPE:
1.1. PRODUCT KEY:
1.2. OVERVIEW:
Description of the appliance
1
3
2
4
5
6 7 8
12 11
10
9
Ref. description Ref. description
1 Water tank
2 Coffee beans hopper
3 Main power switch
4 Grind adjustment
5 Brew unit
6 Front (control) panel
7 SBS
8 Hot water/steam nozzle
9 Grid
10 Fulltankoat
11 Height adjustable dispenser
12 Drip tray
MCA 16: MCA 15 NA P:
M=machine M=machine
C=coffee C=coffee
A=automatic A=automatic
16=index number 15=index number
N=North
A=America
P=connection to water supply

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Service Manual
P0055 Coffee Machine - 2006
Edition
2006.08.28
Language
English
1.3. INTERFACE
13 14 15 18 19
1716 20 21 22
Ref. description Ref. description
13 PROGRAMMING/EXIT select button
14 PAGES forward button
15 SELECT/CONFIRM button
16 DOUBLE COFFEE selection button
17 LUNGO COFFEE select button
18 NORMAL COFFEE select button
19 ESPRESSO select button
20 HOT WATER select button
21 STEAM select button
22 DESCALE select button
DOCUMENTATION REQUIRED:
The following technical documentation is required for repairs:
-Instructionbookletofspecicmodel
-Technicaldocumentationofspecicmodel
TOOLS AND EQUIPMENT REQUIRED:
As well as the standard equipment, the following tools are required:
- Torx screwdrivers
- Crosshead screwdrivers
- 1 Digital thermometer with reading range of more than 150°C
- Must be suitable for measurements in liquids and on surfaces
SAFETY WARNINGS:
Before working on the appliance, read the instruction booklet.
Observe all statutory regulations related to repairs of domestic appliances.
Always disconnect the power supply before repairing the appliance;
itisnotsufcienttoswitchoffthemainpowerswitchtoeliminateelectricshockhazards.
1.4. GENERAL INFORMATION:

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Service Manual
P0055 Coffee Machine - 2006
Edition
2006.08.28
Language
English
1.5. PRODUCT TECHNICAL DATA:
Power supply and
consumption:
230 V~; 50 Hz; 1250 W
120 V; 60 Hz; 1250W
100 V; 60 Hz; 1250 W
Safety devices 2 safety thermostats set at 170°C with heat exchanger
Temperature control NTC sensor
Coffee heating element Stainless steel heat exchanger - (1090W), for coffee or hot
water.
Steam heating element Aluminium tube heat exchanger - (1000W) for steam
production (rapid evaporation)
Pump Ulka vibrating pump;
230V; 50 Hz; 48 W
120V; 60 Hz; 41 W
100V; 50/60 Hz; 55 W
Release valve Pressurised air release valve with compensation valve
Waterlter Located in the water reservoir
Gearmotor supplementary heating
element
437W - 230 V; 275W - 100/120 V approx.
Coffee grinder (burr plate) Threaded spindle in brass, ceramic burrs
Motor 230 V / 120 V / 100 V DC
Power draw During heating: Approx. 5.6 A (230 V);
9 A (120V);
11 A (100V)
Power draw in stand-by Approx. 20 Watt/h
Cup heater power draw 8 Watt (at operating temperature)
Main pump 15 bar
Dimensions WxDxH (mm) 285/400/375
Weight Approx. 11 kg
Coffee hopper capacity (in beans) Approx. 300 gr
Water reservoir capacity Approx. 2 l at maximum level
Heat exchanger volume Approx. 1.0 cm3 (10 ml)
Waterllingtime Approx. 10 sec. at initial power-on.
Heating time Approx. 1.5 min
Steam production Instant

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Service Manual
P0055 Coffee Machine - 2006
Edition
2006.08.28
Language
English
2. OPERATING LOGIC
2.1. OPERATING MODES:
The appliance can operate in the following modes:
• User Programming Mode: From the user menu you
can change appliance programming as described
in the instruction booklet.
• Diagnostics Mode: this mode allows service
engineers to adjust operating and service
parameters. This menu contains all the user menu
items plus a series of more complex programming
options reserved for service personnel.
• Test Mode: Used by service personnel to
check operation of the appliance and its main
components.
2.2. USER PROGRAMMING MODE
This mode is accessed by means of the menu button (see instruction booklet)
2.2.1. MENU OPTIONS
The following options can be programmed by the
user:
ENERGY SAVING
RINSING
LANGUAGE
CONTRAST
WATER HARDNESS
WATERFILTER
TEMPERATURE
PROGR. COFFEE LENG.
PROGR. WATER AMOUNT
PROGRAM STEAM TIME
AROMA SMALL COFFEE
AROMA COFFEE
AROMA LARGE COFFEE
PREBREWING
TOTAL COFFEES
TIMER
CLOCK
AUTOMATIC ON/OFF
CLOCK TIME
ON/OFF TIME
SHOW CLOCK TIME
2.3. GROUND COFFEE DOSAGES
The coffee dosage depends on the rpm of the coffee
grinder (controlled by a sensor) and the mechanical
grind setting (by means of the adjuster knob).
2.3.1. DOSAGE PROGRAMMING FOR THE USER (AROMA FUNCTION)
You can select the quantity of ground coffee for
each coffee type (espresso, caffé, lungo coffee) by
setting the “Aroma” parameter. This serves to make
stronger or weaker coffee.
Aroma Type:
• 0: LIGHT (grinder speed of 45 rpm)
• 1: REGULAR (grinder speed of 50 rpm)
• 2: STRONG (grinder speed of 55 rpm).

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Service Manual
P0055 Coffee Machine - 2006
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2006.08.28
Language
English
2.3.2. DOSAGE PROGRAMMING FOR THE ENGINEER
In “Test” mode you can increase the rpm of the cof-
fee grinder in correspondence with each aroma type
(LIGHT, REGULAR, STRONG) by 2.5 rpm.
The available levels are as follows:
2.4. FACTORY SETTINGS
The machine is delivered with the following factory
settings:
Temperature level = 2 (Medium)
Water hardness = 3 (High)
Stand-by delay = 3:00
Prebrewing = 1 (short)
Espresso Quantity = 110
Caffé Quantity = 170
Lungo quantity = 290
Espresso Aroma = 1 (Regular)
Caffé aroma = 1 (Regular)
Lungo Aroma = 1 (Regular)
Power-on time = 0:00
Power-off time = 0:00
Display contrast = 6 (60%)
Waterlter=0(No)
Clock active = 0 (No)
Time visible = 0 (No)
Rinses permitted = 1 (Yes)
Note several factory setting parameters depend on the language set on the appliance:
- if any European language is selected the appliance will present EUROPE settings
- selection of USA English or Canadian French results in US settings.
Level/Aroma type LIGHT REGULAR STRONG
0 20 25 30
1 22,5 27,5 32,5
2 25 30 35
3 27,5 32,5 37,5
4 30 35 40
5 32,5 37,5 42,5
6 35 40 45
7 37,5 42,5 47,5
8 40 45 50
EUROPE USA
Espresso Quantity 110 110
Caffé Quantity 170 285
Lungo Quantity 290 540
Imp. Hot water 260 260
Steam time 20 05
Level/Aroma type LIGHT REGULAR STRONG
0 40 50 60
1 45 55 65
2 50 60 70
3 55 65 75
4 60 70 80
5 65 75 85
6 70 80 90
7 75 85 95
8 80 90 100
COFFEE GRINDER IMPULSES (1 coffee grinder revolution = 2 impulses)
COFFEE GRINDER REVOLUTIONS

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Service Manual
P0055 Coffee Machine - 2006
Edition
2006.08.28
Language
English
2.5. FUNCTIONAL WATER CIRCUIT DIAGRAM
1
2
3
4
56
7
8
9
10
11
12
heating
element
heating
element
hot water / steam
Thermostat
175°
Component Function
1 Water reservoir Water supply
2 Float Water empty detection
3Waterlter Elimination of solids from water
4 Turbine Pulseowmeasurement,adjustsquantity
5 Pump Waterowrate/pressure(15bar)
6 Pressure relief valve Protects the water circuit from overpressure conditions (valve opens at 17-19 bar)
7 Heat exchanger / heating Provides heating for delivery of water, coffee and steam
8 Temperature sensor Transmits current temperature values to the electronic control system
9 Overtemperature thermostat In the event of overheating, disconnects appliance power supply
10 Hot water / steam supply valve When opened delivers hot water or steam
11 Tubular boiler For steam delivery
12 Steam/hot water solenoid valve Opens if wand is blocked

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Service Manual
P0055 Coffee Machine - 2006
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2006.08.28
Language
English
2.6. SBS VALVE
Beverage dispensing
The SBS delivery valve (see fig. 2), which is
adjustable using the knob, serves to alter (increase
or decrease depending on the knob setting) the
owrateofwaterforbrewingintheunit.
This serves to alter the coffee brewing time (extraction
time)andconsequentlytheintensityofavour,while
maintaining the quantity of crema constant.
Function
With the SBS valve in its open position, an
accumulation of coffee is obtained inside the
diaphragm valve due to the low counter-pressure
of the SBS valve. Consequently the membrane
valve needle remains in the fully open position due
to resistance of the spring. The coffee is delivered
rapidly (see Fig. 3).
With the SBS valve in its closed position, an
accumulation of coffee is obtained on the valve
diaphragm resulting in a pressure build-up inside the
valve. The spring succumbs to the counter-pressure
and the valve element consequently reduces the
owofcoffee(seeg.4).
Fig. 1
Fig. 2
Fig. 3
Fig. 4

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Service Manual
P0055 Coffee Machine - 2006
Edition
2006.08.28
Language
English
SBS valve functional check
To check the correct operation of the SBS valve
make a lungo coffee and, while it is being prepared,
check the difference in the rate of delivery from the
maximum to the minimum positions.
The difference in delivery rate is approx. 2.5 times
(and therefore VERY obvious!!).
Knob in MAX position Knob in MED position Knob in MIN position
-> Coffee dispensing -> Coffee dispensing -> Coffee dispensing
fast medium slow
->Efcientcoffeeextraction ->Efcientcoffeeextraction ->Efcientcoffeeextraction
-> Medium counterpressure -> Medium-high counterpressure -> High counterpressure
(Light coffee) (Medium-strong coffee) (Strong coffee)
CREME COFFEE ESPRESSO RISTRETTO
SBS SBS SBS

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Service Manual
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2006.08.28
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2.7. AQUA PRIMA
Ifthe“aquaprima”lterisselectedfromtheuser
menu or the control panel, the system’s water
metering logic functions as follows:
If the “aqua prima” function is enabled, the electronic
control system performs a pulse count of the turbine,
recording one pulse every 2 revolutions.
If the “aqua prima” function is disabled, the electronic
control system performs a pulse count of the turbine,
recording one pulse every revolution.
The graph in the figure below illustrates this
function:
DECALCIFICATION
Hardness
Water hardness
Decalcification
frequency
Decalcification
frequency with use
of Aqua Prima
1
Soft water (up to 7ºdH)
Approx. 3 months 120 litres
Approx. 3 months 240 litres
2
Medium water (7º-14ºdH)
Approx. 2 months 90 litres
Approx. 2 months 180 litres
3
Hard water (15º-21ºdH)
Approx. 6 weeks 60 litres
Approx. 6 weeks 120 litres
4
Very hard water (over 21ºdH)
Approx. 4 weeks 30 litres
Approx. 4 weeks 60 litres

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Service Manual
P0055 Coffee Machine - 2006
Edition
2006.08.28
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English
The AQUA PRIMA filter
The “Aqua prima” filter is a softener filter that
signicantlyreduceswaterhardness,thusreducing
the risk of problems caused by lime scale.
In this context, it should be considered that water
is an essential element in brewing a perfect cup
of coffee, on a par with the coffee blend and roast:
the water must therefore always be perfectly clear
and fresh.
The following section describes the operating modes
andfeaturesofthelter.
The water used to brew the coffee is filtered
immediately prior to delivery.
This strategy guarantees that the water is always
optimal for perfect coffee brewing.
TheSaeco“AquaPrima”lterpuriesthewaterin
fourstagestoachievetrulyuniquecoffeeavour.
1. The activated carbon eliminates undesirable
odours and substances from the water, such as
chlorine. The silver coating of the activated carbon
prevents the reproduction of microbacteria.
2. The ion exchanger reduces lime scale deposits
and eliminates heavy metals and suspended
substances from tap water.
3. A special porous filter intercepts undesirable
microparticulate.
4.Thecorpuscularlter,usedasaconnectionbetween
reservoirandappliance,ltersthewater,retaining
any suspended substances and impurities.
Asseeninthefollowinggraph,the“AquaPrima”lter
reduces water hardness by up to 50 % .
The “Aqua Prima” lter puries up to
60 litres of water or around 600 cups
of coffee.
It should be replaced every 3 months.
Theneedtoreplacethelterisshownby
an indicator light or display message.
If the machine is not equipped with these
control devices, always observe the expiry
dateprintedonthelterpackaging
Allthepartsof“AquaPrima”ltersystem
are tested for contact with food.
The“AquaPrima”lterisfullyrecyclable
and hence environmentally friendly.
The “Aqua Prima” filter packaging
complies with recycling standards as
conrmedbythe“greendot”marking.

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Service Manual
P0055 Coffee Machine - 2006
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2006.08.28
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English
3. COMPONENTS:
3.1. INTERNAL COMPONENTS
Ref. description Ref. description
1 Coffee grinder
2 Power Board
3 Coffee grinder motor
4 Boiler
5 Thermostat
6 Steam boiler
7 Relief and compensation valve
8 Pump
9 Solenoid valve
1
2
3
4
5
6
7
8
9

Wiring diagrams
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Service Manual
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4. WIRING DIAGRAMS:
4.1. WIRING DIAGRAM

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5. ASSISTANCE:
5.1. DIAGNOSTICS MODE
Diagnostics mode includes all the options of the
user programming function plus the “programmer”*
menu, whereby service personnel can access
protected parameters that are not accessible by
the end user.
Some of these parameters are editable, others are
read-only.
To access the diagnosis mode: Switch the machine
on and when in self-diagnosis press the ESPRESSO-
HOT WATER-ESPRESSO buttons (in that order)
within 3 seconds then go to programmer with the
up arrow and press OK.
To quit diagnostics mode
Press the menu button one or more times until “self-
diagnostics” is shown on the display. Alternatively
switch off the machine and then switch it on again.
*Note: These operations can be performed also by
meansofaspecicprogrammer.
DIAGNOSIS-menu
1 LARGE COFFEE (N°IMPULSES)
1 SMALL COFFEE (N°IMPULSES)
1 COFFEE (N°IMPULSES)
PROGR. WATER AMOUNT
PROGRAM STEAM TIME
PARAMETER K1
PARAMETER K2
TEMPERATURE NORMAL
TEMPERATURE HIGH
TEMPERATURE 1°COFFEE
TOTAL GROUNDS
STOP GROUNDS
TOTAL WATER
WATER DECALCIFY
WATERFILTER
H2O SINCE MSG. DESC.
FLOWRATE l/h
PUMP REGULAT.
WATERRESERVE COUNTER
WATERRESERVE STOP
NUMBER
STATUS
DESCALING NUMBER
DESCALING STATUS
MACHINE STATUS
PRODUCTION DATE DAY
PRODUCTION DATE MONTH
PRODUCTION DATE YEAR
SERVICE DATE DAY
SERVICE DATE MONTH
SERVICE DATE YEAR

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Service Manual
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Language
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5.2. TEST MODE
This menu provides the facility to check operation
of the main components of the machine.
To access test mode:
To access this menu switch the machine on
and select the following sequence STEAM -
DECALCIFY - STEAM- DECALCIFY within an
interval of 3 seconds.
When you access Test mode a window will be
displayed containing all the information on the
installed software version.
The user can access the various different levels by
pressing the MENU button. The Menu levels can be
consulted in the sequence M1, M2, M3, M4.
Figure 1. Test mode opening screen.
Level M1: Keypad test.
This level allows the user to check operation of the
keypad.
Therstlineshowsadescriptionofthelevel.
The second line briefly shows the number
corresponding to the selected button.
Figure 2. Level M1 window.
Level M2: I/O test
This level allows the user to check the I/O system
(except in relation to the coffee grinder, which is
covered by a separate menu level). The rst line
shows a description of the level and a space for
analog information, if present (red circle).
The second line shows the active load on the left
(blue circle) and digital information on the right
(green circle).
Figure 3. Level M2 window.

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Microswitches and sensors check
NUMBER DESCRIPTION ACTIVE INACTIVE NOTES
1 Gearmotor WORK
microswitch
Dispenser in
WORK position
Dispenser not in
WORK position
2 Gearmotor HOME
microswitch
Dispenser in
HOME position
Dispenser not in
HOME position
3Front control panel
microswitch
Panel closed Panel open
4GROUNDS
DRAWER
microswitch
Grounds drawer
present
Grounds drawer not
present
5BREW UNIT
microswitch
Present Absent
6DOOR microswitch Door open Door closed
7FLOWMETER The service engineer
can check the pulses
8WATER LEVEL in
reservoir
Level OK
Level LOW
9WATER ALARM
microswitch
Presence of
water on base of
machine
No water on base of
machine.
MCoffee hopper
empty
No coffee present Coffee must be
present.
This information
is derivative and
not obtained by
hardware.
RCLOCK
(seconds advance)
Even seconds Odd seconds Mustashat1HZ

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Check COMPONENT FUNCTIONS
The user can activate functions by pressing the
buttons as shown in the following table. To deactivate
functions, press any button.
The active load is displayed on the second line (blue
circle).
Note: certain loads are equipped with safety
devices that may deactivate them to avoid possible
damage.
*Note:intheplumbed-incongurationthewatersupplysolenoidvalveopensautomaticallywhenthepump
is started.
BUTTON FUNCTION SAFETY INFORMATION
UP The brew unit moves up WORK microswitch must be
deactivated.
The grounds drawer
microswitch must be active.
The door must be closed
Motor current [mA]
DOWN The brew unit moves
down
HOME microswitch must be
deactivated.
The grounds drawer
microswitch must be active.
The door must be closed
Motor current [mA]
OK Coffee boiler heating
element powered
Temperature [°C]
DOUBLE COFFEE Steam boiler heating
element powered
LUNGO COFFEE Pump * No water supplied
CAFFÉ Pump + water supply
solenoid valve *
Water supplied
ESPRESSO Water supply valve
HOT WATER Display backlighting
STEAM Display contrast
DECALCIFICATION Water supply solenoid
valve

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Level M3: Tests on coffee grinder
This level allows the service engineer to check
operation of the coffee grinder.
Therst lineshows adescription ofthe leveland
a space for analog information, if present (red
circle).
The second line shows whether or not the load is
active (blue circle). Additional information is shown
intheredcircleandtheashing“X”(greencircle).
When the coffee grinder is operating (UP button) the
speedisshowninrpm(redcircle)andthe“X”ashes
(green circle).
“v” can show one of the Aroma levels: 0 - 1 - 2 (see
heading 2.3.2). The value can be edited with the
DOWN button and saved by pressing OK.
If the value has been edited but not saved the
“*” symbol will be displayed at the end of the second
line. When the value is saved, the “*” symbol
disappears.
Level M4: Jumpers
Inthissectionyoucancheckthejumperconguration,
i.e. the presence or absence of certain jumpers.
Figure 1. e.g.: all jumpers present
Figure 2. e.g.: only jumper JP27 present
Note: the presence of JP27 is required for the
plumbed-in conguration: in this case the “water
connection” option appears automatically in the
user menu, although it must still be activated if it is
to be used.
How to quit Test mode.
Switch off the machine and then switch it on again.