Service Manual
Revision 01 December 2012
All parts of this document are the property of Saeco International Group.
All rights reserved. This document and all the information herein is provided without liability deriving from any errors or omissions. Furthermore, no part may be reproduced,
used or collected, except where express authorisation has been provided in writing or through a contractual agreement.
Published by Saeco International Group Subject to modifi cation EN 4219 400 00012
Service
Co ee Machine
RI 9933
Gaggia Unica
Table of contents Page
1. Introduction
1.1. Documentation required 1
1.2. Tools and equipment required 1
1.3. Material 1
1.4. Safety warnings 1
1.5
Service POLICY 2
1.6.1. External machine parts 3
1.6.2. Internal machine parts 4
2. Technical specifi cations
2.1. Technical specifi cations 1
2.2 Specifi cation for the measurement of the coffee
products temperature.
2
2.3. Machine parameters and performance 3
3. User instructions
3.1. Customer and programming menu 1
3.2. Machine indications 2
3.3. Operation, cleaning and maintenance 3
4. Operating logic
4.1. Water circuit 1
4.2. Coffee cycle 2
4.3. Single microswitch 3
4.4. Temperature sensor 3
4.5. Coffee grinder 4
4.6. Low bean level detection, dose quantity adjustment,
coffee grinder blocked
4
Table of contents Page
4.7. Dose self-learning (SAS) 5
4.8. Water level detection (water tank) 6
4.9. Water level detection (drip tray) 6
4.10. Descaling request 7
4.11. Water fi lter 7
5. Troubleshooting
5.1. Test mode 1
5.2. Error messages 3
6. Standard checks
6.1. Repair schedule 1
6.2. Service schedule 1
6.3. Final test 2
7. Disassembly
7.1. Outer elements 1
7.2. Coffee grinder 1
7.3. Grinder blades 2
7.4. Coffee grinder adjustment 3
7.5. Pump 4
7.6 Turbine 4
7.7 Power card 4
7.8 Caldaia 4
7.9 Gearmotor 5
2011-June-08
Saeco International Group Rev. 01 GAGGIA UNICA
Table of contents Page
7.10. Cock card and hot water/steam cock 6
7.11. Dispenser assembly 6
7.12. CPU and display card 6
7.13. Fitting and removing Oetiker clamps 7
8. Notes
9. Water circuit diagram
10 Electrical diagram
Saeco International Group Rev. 01 GAGGIA UNICA
GAGGIA UNICA 01 INTRODUCTION
Saeco International Group Rev. 01 Page / 04
1.1 Documentation required
The following documentation is needed for repair procedures:
• Instruction booklet for specifi c model
• Technical documentation for specifi c model (diagrams, exploded drawings)
1.2 Tools and equipment required
As well as the standard equipment, the following is required:
Qty. Description Notes
1 Screwdriver Torx T 8 - T 10 - T 20
1 Pliers for Oetiker clamps
1 CC -A - Vdc tester
1 Digital thermometer Scale limit > 150°C
1 SSC (Saeco Service Center) Programmer
(for programming and diagnostics mode)
1.3 Material
Description Notes
Thermal paste Heating element > 200°C
Descaler Saeco descaler
Grease solvent Personal choice
Silicone grease Safe to use with food
1.4 Safety warnings
We recommend you consult the technical manual of the machine before performing any
maintenance work.
Observe all applicable standards relating to the repair of electrical appliances.
Always disconnect the power plug from the mains before beginning repair work.
Simply turning off the main machine power switch is not an adequate safety precaution.
This domestic appliance is rated as insulation class I.
On completion of the repair work, insulation and dielectric rigidity tests must be performed.
01
GAGGIA UNICA 01 INTRODUCTION
Saeco International Group Rev. 01 Page / 04
02
Components Assembly use Single components available
COFFEE
GRINDER
Only for OOW repairs
YES, to consult the specifi c exploded-view of the
machine or of the Coffee Grinder on website
BREWING
UNIT
Only for OOW repairs
YES, to consult the specifi c exploded-view of the
machine or of the Brewing unit on website
BOILER Only for OOW repairs
YES, to consult the specifi c exploded-view of the
machine on website
GEAR
MOTOR
Only for OOW repairs
YES, to consult the specifi c exploded-view of the
machine on website
FILTER
HOLDER
Only for OOW repairs
YES, to consult the specifi c exploded-view of the
machine on website
MILK
CARAFE
Only for OOW repairs
YES, to consult the specifi c exploded-view of the
machine on website
THERMAL
CARAFE
Only for OOW repairs
YES, to consult the specifi c exploded-view of the
Thermal Carafe on website
MILK ISLAND Only for OOW repairs
YES, to consult the specifi c exploded-view of the
Milk Island on website
1.5 Service POLICY grid as used for coffee machine
List of principal assembly present in all our coffee machines
For IN WARRANTY repairs is mandatory to use the single components (not the assembly) avai-
lable in the exploded views of the coffee machines or of the specifi c components. If you fi nd the
information “SEE THE EXPLODED VIEW E........” in the assembly description fi eld, it means that
the single components of the assembly are available in the other pages of the exploded view. It’s
possible to use the assembly only if there is a specifi c Symptom Cure that include this possibility
or when the single components are not available for the order.
GAGGIA UNICA 01 INTRODUCTION
Saeco International Group Rev. 01 Page / 04
1.6.1 External machine parts
03
Drip
tray+grille
Coffee bean hopper
with lid
Hot water/steam
dispensing pipe
Dispensing pipe
protection
Brewing unit
Dreg drawer
Power supply socket
Grinding
adjustment
Water tank
Control panel
Coffee
dispenser
Service
hatch
Hot water/steam
dispensing knob
LED display
Espresso
dispensing button
ON/OFF button
steam selection
button
Long coffee
dispensing button
GAGGIA UNICA 01 INTRODUCTION
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1.6.2 Internal machine parts
04
Pump
Turbine
Boiler
Thermostats
Hot water/steam valve
Hot water /steam cock card
Power card
Coffee grinder
Grinding
adjustment insert
Steam pipe
Power cable connector
Safety valve
Saeco International Group Rev. 01 GAGGIA UNICA
GAGGIA UNICA 02 TECHNICAL SPECIFICATIONS
Saeco International Group Rev. 01 Page / 04
2.1. Technical specifi cations
Power supply and output: 240 V~ 50 Hz 1400 W - 230 V~ 50/60 Hz 1400 W -
120 V~ 60 Hz 1500 W - 100 V~ 50/60 Hz 1300 W
Temperature monitoring: (NTC) variable resistor sensor - transmits the value to the
electronic card
Safety system:
2 thermostats at 175°C one shot
Coffee heat exchanger output:
Stainless steel
(230/120 V~) 1300 W – (100 V~) 1100W
for coffee, hot water and steam dispensing
Steam heat exchanger output:
Stainless steel
As above
Gearmotor: 2 rotation directions; power supply 24VC
Pump Ulka Type EP5/S GW approx. 13-15 bar with reciprocating
piston and thermal switch 100°C 48 W, 230V, 50 Hz, 120V,
60Hz 100V, 50/60 Hz
Overpressure valve: Opening at approx. 18-20 bar
Water fi lter: In tank
Coffee grinder: Direct current motor with fl at ceramic grinder blades
Automatic dosage Dose adjustment controlled by the electronic system
Power consumption: During heating phase- approx. 5.6 A
Dimensions: W x H x D in mm: 320x372x461
Weight: 9 kg
Water tank capacity: 1.7 l.
Coffee bean hopper capacity 250 g. of coffee beans
Dreg drawer capacity 14
Heat exchanger capacity: Approx. 10 cc
Water circuit fi lling time: Approx. 15 sec Max. on fi rst fi lling cycle
Heating time: Approx. 45 sec.
Grinding time: Approx. 8-10 sec.
01
GAGGIA UNICA 02 TECHNICAL SPECIFICATIONS
Saeco International Group Rev. 01 Page / 04
02
2.2. Specifi cation for the measurement of the coffee products temperature.
The temperature is infl uenced by the fl ow from the dispenser and stratifi cation of temperatures in
the glass. In order to consider these phenomena and to introduce measures that allow comparisons in controlled conditions, below guidelines must be followed:
Conditions:
a) Water temperature in tank: 23°C (+/-2°C).
b) It must be used a plastic cup (see picture N°1).
c) It must be used a thermocouple thermometer (e.g. type K - see picture N°2).
d) The coffee machine is tested without any change of parameters or calibrations, which may
affect the temperature of products, so the measurement of temperature must be done with
machine in default factory setting.
Procedure:
1. The temperature must be measured in the cup, immediately after dispensing. Cup has to be
placed on a non-metal surface using a thermocouple thermometer.
2. The temperature in the cup is measured by immersing the probe of the thermometer up to
touch the bottom.The probe then must be moved in a circular motion for 5/6 rotations. At the
of the rotations, stop in the center of the cup.
3. The highest temperature measured during the rotations is the value we are searching for, and
that must be reported;
4. Test measurement: from end of dispensing to the end of rotations must be completed within 12
seconds.
Limits of acceptability
The acceptance limits are divided by features and products and are the following:
Espresso Coffee Italy Q.ty 25/40 gr.
Temperature of 1st product 69°C ≤ 85°C
Temperature of 2nd product 72°C ≤ 85°C
Coffee Q.ty 70/120 gr.
Temperature of 1st product 69°C ≤ 85°C
Temperature of 2nd product 72°C ≤ 85°C
Picture 1
Picture 2
GAGGIA UNICA 02 TECHNICAL SPECIFICATIONS
Saeco International Group Rev. 01 Page / 04
2.3. Machine parameters and performance
PRODUCT
QUANTITY
Minimum
quantity
(Puls.)
Default
quantity
(Puls.)
Maximum
quantity
(Puls.)
User
programmable
Programm. by
Production / Service
Espresso 50 130 - 170 600 Yes No
Long coffee 70 200 - 230 600 Yes No
Pre-ground No
Hot water Continues for 400 pulses
Steam for
frother
Continues until the water supply has been exhausted (capacitive sensor)
RINSE Initial rinse Final rinse
When performed When the machine is switched
on and the boiler temperature is
≤ 50°C
When the machine is switched
off electronically, manually or
automatically after 60', if at least
one coffee has been dispensed,
before switching off
No. of pulses 130 100
Stopping option Yes, by pressing any key Yes, by pressing any key
User disable option No No
Production/Service
department disable option
No No
No. of pulses user
adjustment option
No No
No. of pulses Production/
Service department
adjustment option
No No
Pulse range
(Min. – Max.)
No No
03
Descaling cycle frequency
Hardness Water hardness Without water fi lter With water fi lter
1 Soft (up to 7°dH) 240 litres (480,000 pulses) 480 litres (960,000 pulses)
2 Medium (7°-14dH) 120 litres (240,000 pulses) 240 litres (480,000 pulses)
3 Hard (15°-21°dH) 60 litres (120,000 pulses) 120 litres (240,000 pulses)
4 Very hard
(over 21°dH)
30 litres (60,000 pulses) 60 litres (120,000 pulses)
The default water hardness level is 3. Each litre of water corresponds to approximately 2,000
pulses
GAGGIA UNICA 02 TECHNICAL SPECIFICATIONS
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WATER TANK Description
Water reserve (pulses) with water fi lter 200
Water reserve (pulses) with no water fi lter 200
Water reserve modifi able by Production/Service
departments
No
"Fill tank" alarm Yes
"No tray" alarm Yes
Water mains No
DREG DRAWER Description and values
Time-out for dreg drawer
5 sec.
Warning to empty dreg drawer after
Yes, after 14 lots of dregs
Reset dreg counter
The dreg drawer must be emptied only
when prompted by the machine ensuring
the machine is switched on and removing
the drawer for more than 5 seconds.
STANDBY Description and values
Inlet time (default) 60 minutes
Inlet time programmed by Production/
Service department
Yes
Boiler temperature during Standby Boiler OFF
04
Saeco International Group Rev. 01 GAGGIA UNICA
GAGGIA UNICA 03 USER INSTRUCTIONS
Saeco International Group Rev. 01 Page / 03
3.1. Customer and programming menu
Machine ready for dispensing
coffee with coffee beans and hot
water
Machine dispensing steam
Machine dispensing hot water
Machine dispensing espresso or
long coffee
Machine dispensing two espressos
or two long coffees
Machine in pre-heating phase
for coffee, hot water and steam
dispensing.
Machine in rinsing phase. Wait for
the machine to end the operation
Machine in steam heating phase
Machine overheated.
Dispense water to take the
machine to the ideal temperature
for dispensing coffee and hot
water
Machine ready signals
Notice signals
01
Lampeggianti
in ciclo
BLINKING
IN CYCLE
Fissi
STEADY
Fisso
STEADY
Fisso
STEADY
Fisso
STEADY
Fisso
STEADY
Lampeggianti
BLINKING
Lampeggianti
BLINKING
Lampeggiante
BLINKING
ON/OFF button
Steam selection button
Long coffee dispensing button
Espresso dispensing button
The machine is being
programmed with the coffee cup
fi ll level
The appliance requires a descaling
cycle
The machine requires a water
circuit fi lling cycle
Lampeggiante
BLINKING
Lampeggiante
veloce
BLINKING
FAST
Fisso
BLINKING