Teka RBF 78720 User manual

Service Manual
MSFR19010 EN
(December 2019)
Related models:
RBF 78720
RBF 78630
RBF 74620

Service Manual
RBF 78720/78630/74620
Service Manual: MSFR19010 EN - 1 -
Contenido
1. Introduction.......................................................................................................... - 2 -
2. General description .............................................................................................. - 2 -
3. Control panel ........................................................................................................ - 3 -
4. General operation ................................................................................................ - 3 -
5. Service test ........................................................................................................... - 5 -
6. Error messages ..................................................................................................... - 6 -
7. Wiring diagram RBF 78630/74620 ....................................................................... - 8 -
8. Wiring diagram RBF 78720................................................................................... - 9 -
9. Refrigerant circuit............................................................................................... - 10 -
10. Components .................................................................................................... - 11 -

Service Manual
RBF 78720/78630/74620
Service Manual: MSFR19010 EN - 2 -
1. Introduction
This manual explains the general operation of the RBF range refrigerators, how to
enter the service mode and the meaning of the different error messages that could be
displayed.
2. General description
All the models in the RBF range are electronic no-frost refrigerators. The temperature
in each compartment can be adjusted independently, and there’s no air flowing from
one to the other.

Service Manual
RBF 78720/78630/74620
Service Manual: MSFR19010 EN - 3 -
3. Control panel
1. Refrigerator setting
2. Quick cooling mode indicator
3. Freezer setting
4. Quick freezing mode indicator
5. Alarm indicator
6. ECO mode indicator
7. Holiday mode indicator
8. Child lock indicator
9. Refrigerator Tª sensor
10. Freezer Tª sensor
11. “Mode”sensor
In order to set the temperature of a compartment, first, the sensor of that
compartment must be pressed to select it, and then, press it repeatedly until the
desired temperature is shown in the display. After a few seconds, the value is set in
memory.
4. General operation
The range of values that can be set for each compartment are:
-Refrigerator: 2ºC a 8ºC
-Freezer: -16ºC a - 24ºC
The compressor will be on until both compartments reach the target temperature. For
example, if the target temperature in the refrigerator is reached, but the temperature
in the freezer isn’t, the compressor goes on working and a heater element in the
refrigerator is turned on to prevent too low temperatures.
Operating modes
Super cooling mode: when selected, target temperature in refrigerator is set to 2ºC.
Super freezing mode: when selected, target temperature in refrigerator is set to -24ºC.

Service Manual
RBF 78720/78630/74620
Service Manual: MSFR19010 EN - 4 -
Holyday mode: when selected, the freezer is set to -18ºC and the refrigerator to +16ºC.
ECO mode: when selected, the control board will decide the internal parameters in
order to reduce consumption. The display will show “E”.
Drink cooling mode: when selected, it will be requiered to choose how long this mode
should be active. After that time, this mode will be turn off automatically..
Demo: in order to turn on the “DEMO” mode, within the first 60 seconds after plugging
the refrigerator, press simultaneously for 5 seconds the sensors “M” and “Freezer Set”.
Every 10 seconds “dE” – “On” will be displayed. This mode won’t be cancelled after a
black out. To cancel it, follow the same steps as to activate it.
First start
When the refrigerator is plugged to the power supply, if the defrost sensor is
measuring a temperature higher than -5ºC, the next steps are executed:
-The compressor and fan turn on for 5 seconds.
-The defrost element turns on for 5 seconds.
-The heater element in the refrigerator turns on for 5 seconds.
-Refrigerator’s fan turns on for 5 seconds.
After this sequence ends, the refrigerator stops for 5 minutes, and then will start to
work normally.
After a black out, settings are kept in memory, so they won’t be restored to factory
settings.
Freezer defrosting
Depending on the use of the refrigerator (quantity of food and liquids, door openings,
…), the defrosting cycle is turned on after a minimum of 8 hours, and a maximum of 55
hours. The defrost cycle ends when the defrost sensor reaches 8ºC. If it takes longer
that 37 minutes, the target temperature will be set to 15ºC.
Refrigerator defrosting
The defrosting cycle in the refrigerator turns on at the same time that the defrost cycle
in the freezer, unless the sensor does not detect +5ºC three times in 9 hours, having at
least 5 hours of compressor working time. The defrosting cycle ends when the sensor
measures +7ºC.

Service Manual
RBF 78720/78630/74620
Service Manual: MSFR19010 EN - 5 -
5. Service test
To enter de Service test, these steps must be followed:
-Press and keep pressed the Freezer Set sensor while open and close the
refrigerator’s door 3 times. After 3 seconds, the Service test is launched.
-If a component fails, an error message will be displayed in this moment.
Otherwise, nothing is displayed.
-While in Service test mode, there is a “beep” every 5 seconds.
-The Child lock LED will blink.
-The different functions can be accessed pressing the sensor “M”, according to the
table below.
Funciones modo servicio
TOUCHING M (MODE)
BUTTON ONCE
Starting mode:
- Eco icon blinks.
- The number of components which is controlled is shown at freezer
segments of display.
- Eco icon goes off when the starting test finishes and then display
returns to initial service mode..
TOUCHING M (MODE)
BUTTON TWICE
Manual Defrost:
-Holiday icon blinks.
-Defrost might be finished manually or automatically.
-Defrost might be finished manually by using the cooling set button.
Holiday icon goes off and display returns to initial service mode.
-Automatic defrost operates according to the standard defrost time.
-Holiday icon goes off when he when the manual defrost ends and
display returns to initial service mode.
TOUCHING M (MODE)
BUTTON 3 TIMES
Motor Damper control mode (only models with damper):
-Fast Cooling icon blinks.
-There is no function due to not having damper component in the
product.
-SC icons goes off and display returns to initial service mode.
TOUCHING M (MODE)
BUTTON 4 TIMES
Current temperature values indicator:
-Fast freezing icon blinks.
-Pressing the Freezer set sensor, current values will be displayed:
1 –Refrigerator’s sensor.
2 –Freezer’s sensor.
3 –Defrosting sensor.
4 –Ambient sensor (not available in these models)
5 –Refrigerator’s defrosting sensor
-Touching cooler set icon, function will be finished manually.
-Fast freezeng icon goes off and display returns to initial service
mode.
TOUCHING M (MODE)
BUTTON 5 TIME
Door switch control:
-No icons at display.
-Cooler set segment gives information about cooler door.
-Mode just could be deactivated by cooler set button.

Service Manual
RBF 78720/78630/74620
Service Manual: MSFR19010 EN - 6 -
6. Error messages
The table below shows the different error messages that can be displayed and their
meaning:
Mesg. In display
Mesg in service mode
Description
SR
FE01
Failure in freezer sensor (1) (*)
SR
FE02
Failure in refrigerator sensor (2) (*)
SR
FE03
Failure in defrosting sensor (3) (*)
SR
FE04
Failure in refrigerator’s defrosting sensor
(5) (*)
SR
FF12
Failure in (1) y (2) (*)
SR
FF13
Failure in (1) y (3) (*)
SR
FF15
Failure in (1) y (5) (*)
SR
FF23
Failure in (2) y (3) (*)
SR
FF25
Failure in (2) y (5) (*)
SR
FF35
Failure in (3) y (5) (*)
SR
FH02
Failure in (1), (3) y (5) (*)
SR
FH04
Failure in (1), (2) y (3) (*)
SR
FH05
Failure in (1), (2) y (5) (*)
SR
FH06
Failure in (2), (3) y (5) (*)
SR
FU00
Failure in all the sensors(*)
SR
FO05
Failure in compressor, (3) Temperature is
above -10ºC after 10 minutes working.
SR
FO06
Failure in defrosting cycle. (3)
Temperature does not reach 0ºC
Muestra “-“ en ambos
displays
_
Low voltage. Voltage is under < 170 V.
Parpadea display
congelador y alarma
CO01
(1) does not drop below -10ºC (**)
Parpadea display
conservador y alarma
CO02
(2) is above 10ºC and Holiday mode is not
active. (**)
Parpadea display
conservador y alarma
CO03
Temperature too low in refrigerator. (2)
drops below -5ºC(**)
Parpadean ambos
displays y alarma
CO04
(2) is above 15ºC y (1) above -10ºC(**)

Service Manual
RBF 78720/78630/74620
Service Manual: MSFR19010 EN - 7 -
(*) If a failure in a sensor is displayed, follow the steps below:
- Check the wiring and conections between the sensor and de control board.
- Check the ohmic value of the sensor, and compare it with the table in section 8. If the
sensor is “open”(value ≈ ∞) or “short-circuited”(value ≈ 0Ω), it must be replaced.
- If the previous steps are correct, the control board must be replaced.
(**) In order to avoid fake alarms, error messages won’t be displayed under the
following conditions:
-Within 6 hours after plugging the appliance to the power supply.
-Within the defrost cycle.
-Within 2 hours after a defrost cycle.
-Within 2 hours after a door opening.

Service Manual
RBF 78720/78630/74620
Service Manual: MSFR19010 EN - 8 -
7. Wiring diagram RBF 78630/74620

Service Manual
RBF 78720/78630/74620
Service Manual: MSFR19010 EN - 9 -
8. Wiring diagram RBF 78720

Service Manual
RBF 78720/78630/74620
Service Manual: MSFR19010 EN - 10 -
9. Refrigerant circuit

Service Manual
RBF 78720/78630/74620
Service Manual: MSFR19010 EN - 11 -
10.Components
Temperature sensors
All temperature sensor have the same measuring range:
Congelador y conservador
T(ºC)
R(KΩ ）
T(ºC)
R(KΩ ）
45 °C
1kΩ
-1 °C
6.2kΩ
35 °C
1.5kΩ
-3 °C
6.8kΩ
30 °C
1.8kΩ
-5 °C
7.5kΩ
25 °C
2.2kΩ
-7 °C
8.2kΩ
19 °C
2.7kΩ
-12 °C
10kΩ
14 °C
3.3kΩ
-15 °C
12kΩ
10 °C
3.9kΩ
-20 °C
15kΩ
5.5 °C
4.7kΩ
-24 °C
18kΩ
1.5 °C
5.6kΩ
-31.5 °C
27kΩ
0 °C
6kΩ
-35.5 °C
33kΩ
Desescarche
Tª(ºC)
R （ KΩ ）
Tª(ºC)
R （ KΩ ）
45 °C
2.15kΩ
-1 °C
17.1kΩ
35 °C
3.26kΩ
-3 °C
19kΩ
30 °C
4.02kΩ
-5 °C
21.1kΩ
25 °C
5kΩ
-7 °C
23.5kΩ
19 °C
6.53kΩ
-12 °C
30.8kΩ
14 °C
8.23kΩ
-15 °C
36.5kΩ
10 °C
9.95kΩ
-20 °C
48.6kΩ
5.5 °C
12.3kΩ
-24 °C
61.5kΩ
1.5 °C
15kΩ
-31.5 °C
98kΩ
0 °C
16.3kΩ
-35.5 °C
12.6kΩ
Important: To check the temperature sensors:
-They must be disconected from the control board.
-Real temperature must be measured in order to compare it with the sensor
measurement.

Service Manual
RBF 78720/78630/74620
Service Manual: MSFR19010 EN - 12 -
Fans
-Refrigerator fan
Supply voltage: 12 VDC
-Freezer fan
Supply voltage: 230 VAC
-Condensator fan (only RFB 78720)
Supply voltage: 12 VDC
Compressor
Supply voltage: 230 VAC –50 Hz.
*Model RBF 78630 has an inverter compressor, powered by an specific power board.

Service Manual
RBF 78720/78630/74620
Service Manual: MSFR19010 EN - 13 -
Defrosting element
RBF 78630/74620
Supply voltage: 230 VAC
Power: 124 W
RBF 78720
Supply voltage: 230 VAC
Power: 160 W
Thermal fuse
The thermal fuse breaks if the temperature reaches over 77ºC.