Electrolux FROST REFRIGERATORS with ERF2021 electronic User manual

SERVICE MANUAL
REFRIGERATION
© ELECTROLUX HOME PRODUCTS S.p.A. Publication no.
Spares Operations Italy 599 37 38-00
Corso Lino Zanussi, 30 051031
I - 33080 PORCIA / PN (ITALY) ITZ/SERVICE/AA
Fax [phone]
PARTIAL NO
FROST
REFRIGERATORS
with
ERF2021
electronic
FACTORY: HUY

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TABLE OF CONTENTS
1. INTRODUCTION ..................................................................................................................................................4
2. AIR FLOW ............................................................................................................................................................6
3. REFRIGERATOR CIRCUIT .................................................................................................................................8
4. ELECTRIC WIRING .............................................................................................................................................9
5. FUNCTIONAL DIAGRAM ................................................................................................................................. 11
6. COMPONENTS ................................................................................................................................................. 12
6.1. Control panel............................................................................................................................................... 12
6.2. Electronic boards ........................................................................................................................................ 13
6.2.a. Power control board ERF2021................................................................................................................. 14
6.2.b. Display board ERF2000........................................................................................................................... 16
6.3. Cooler and freezer compartments .............................................................................................................. 17
6.3.a. Temperature sensors............................................................................................................................... 19
6.3.b. Door switches........................................................................................................................................... 19
6.3.c. Balancing heater ...................................................................................................................................... 20
6.3.d. Cold module fan....................................................................................................................................... 20
6.3.e. Defrosting heater ..................................................................................................................................... 20
6.3.f. Thermal switches ...................................................................................................................................... 21
6.4. Compressor compartment .......................................................................................................................... 22
6.4.a. Connections box ...................................................................................................................................... 22
7. OPERATION ..................................................................................................................................................... 23
7.1. Normal......................................................................................................................................................... 23
7.2. Normal with first switching on or power failure ........................................................................................... 24
7.3. Defrosting.................................................................................................................................................... 25
7.4. Flow chart for the defrosting management ................................................................................................. 26
7.5. SUPER function (rapid freezing)................................................................................................................. 27
7.6. SHOPPING Function (rapid cooling) .......................................................................................................... 27
7.7. Malfunctioning of cooler air temperature sensor......................................................................................... 29
7.8. Malfunctioning of freezer air temperature sensor ....................................................................................... 30
8. ALARM SIGNALLING....................................................................................................................................... 31
8.1. Freezer compartment temperature alarm ................................................................................................... 31
9. DEMO MODE .................................................................................................................................................... 32
9.1. Start DEMO MODE.................................................................................................................................... 32
9.2. Exit DEMO MODE ...................................................................................................................................... 32
9.3. Functions of the DEMO MODE................................................................................................................... 32
10. ACCESSIBILITY TO FREEZER COMPARTMENT........................................................................................34
10.1. Battery evaporator .................................................................................................................................... 34
11. ACCESSIBILITY TO CONTROL PANEL ....................................................................................................... 38
12. TROUBLESHOOTING .................................................................................................................................... 39
12.1. Excessive ice formation on the battery: .................................................................................................... 39
12.2. Failed defrosting: ...................................................................................................................................... 39
13. DISPLAY SYMBOLS ...................................................................................................................................... 40

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1. INTRODUCTION
This manual describes the Partial No Frost Refrigerators with ERF2021 electronic produced in the Nyíregyháza
factory called HUY.
These models feature:
- Partial No Frost (no frost freezer, static refrigerator)
- Free standing
- single-compressor
- electronic controls (electronic board ERF2021)
- liquid crystal display (LCD)
They are appliances (CBFF 340 e CBFF 380) with the following PNCs:
PNC MODEL BRAND
925033001 ANB3450 Arthur Martin Electrolux
925033002 ENB3450 Electrolux
925033004 ZNB3450 Zanussi-Electrolux
925033041 399.774-9/40800 Privileg
925033042 ZKN3406 Zanker
925033201 ENB3850 Electrolux
925033203 ZNB3850 Zanussi-Electrolux
925033229 974.027-5/40801 Privileg
925033230 ZKN3806 Zanker
The controls of the appliance are inserted into the work top.
The power control board is ERF2021.
The user interface board is ERF2000 (liquid crystal display LCD).
Since it is a single-compressor, it is not possible to switch off only one of the two compartments.
The temperatures regulation is the following:
from +8 to +2 ° for the cooler
from -16 to -22 °C for the freezer
The LCD display enables to show not only the compartment temperatures but also the room temperature.
The appliance has the following functions:
rapid freezing
rapid cooling
freezer temperature alarm
Moreover, since there is a balancing heater inside the appliance automatically actioned by the electronic board,
it is not necessary that the user regulates the set temperatures for the freezer compartment when the room
temperature is low.

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The appliance consists of the following compartments:
freezer;
cooler;
The evaporating circuit consists of
cold module (freezer compartment);
tube evaporator (refrigerator compartment).
Key:
A = control panel
B = cooler compartment
C = cold module
D = No Frost freezer compartment
A
B
C
D

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2. AIR FLOW
Unlike the NO FROST refrigerators, in the PARTIAL NO FROST type the cooler and freezer compartments are
separated physically.
The battery evaporator cools only the freezer compartment, while the tube evaporator cools only the cooler
compartment.
The cold produced by the battery evaporator in the freezer compartment, is distributed by the fan C placed
behind the cold module.
In case of door opening the fan stops.
To simulate the door closed, press the button of the freezer door.
A
IR FLOW
C

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3. REFRIGERATOR CIRCUIT
Key:
1. compressor;
2. condenser;
3. anti-condensation coil;
4. dehydrator filter;
5. capillary;
6. battery evaporator (freezer compartment);
7. tube evaporator (cooler compartment);
8. exchanger.

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4. ELECTRIC WIRING
(check the specific diagram for each model!)

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Key:
2. compressor
5. motor protector
9. defrosting heater
10. balancing heater
13. lamp
15. cooler door switch
16. freezer door switch
24. fan
26. safety thermal switch (+40°C)
27. defrosting cut-out switch (+8°C)
28. running capacitor (only for the models which feature it)
41. electronic board
56. cooler air temperature sensor (cable colour: brown)
57. freezer air temperature sensor (cable colour: white)
a. yellow-green;
b. brown;
c. blue;
d. white;
e. black;

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5. FUNCTIONAL DIAGRAM
(check the specific diagram for each model!)
Key:
2. compressor
5. motor protector
9. defrosting heater
13. lamp
15. cooler door switch
16. freezer door switch
24. fan
26. safety thermal switch (+40°C)
27. defrosting cut-out switch (+8°C)
28. running capacitor (only for the models which feature it)
41. electronic board

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6. COMPONENTS
6.1. Control panel
Key:
A. ON/OFF button;
B. Temperature regulation knob of the freezer compartment;
C. Temperature displaying button;
D. Temperature and function displaying;
E. Function activation button (temperature alarm reset of freezer compartment);
F. Temperature regulation knob of cooler compartment;
Key:
1. Room temperature symbol
2. Cooler compartment symbol
3. Freezer compartment symbol
4. Temperature indicator (symbol – or +)
5. SUPER function (rapid freezing)
6. Temperature alarm symbol of freezer compartment
7. SHOPPING function (rapid cooling)

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6.2. Electronic boards
The electronic board consists of:
1. power control board ERF2021
2. display board ERF2000
The two electronic boards are connected by means of a flat cable with a connector; therefore, the two boards are
available singularly as spare part.

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6.2.a. Power control board ERF2021
View of power board (components side):
1. line
2. compressor
3. neutral
4. free
5. balancing heater
1. fan line
2. fan neutral
3. defrosting heater neutral
4. defrosting heater line
1. free
2. free
3. freezer door switch
4. freezer door switch

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1. cooler air temperature sensor
2. cooler air temperature sensor
3. free
4. free
5. freezer air temperature sensor
6. freezer air temperature sensor
1. free
2. free
3. free
4. free

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6.2.b. Display board ERF2000
Key:
SW1 = function activation button;
SW2 = ON/OFF button;
SW3 = temperature displaying button;
SW4 = reed element (optional);
LCD = liquid crystal display;
POT1 = freezer compartment temperature regulation;
POT2 = cooler compartment temperature regulation;
NTC1 = room temperature sensor.

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6.3. Cooler and freezer compartments
Key:
A = cooler air temperature sensor
B = freezer air temperature sensor
C = room temperature sensor
1 = balancing heater
2 = cooler door magnet
3 = display board reed element
4 = cooler door button
5 = freezer door button
1
2
3
4
5
A
B
C

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Key:
6 = thermal switches
7 = cold module fan
8 = cold module defrosting heater
6
7
8

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6.3.a. Temperature sensors
3 sensors are used to detect the various temperatures:
cooler air temperature sensor A (located on the cooler cell)
freezer air temperature sensor B (located on the freezer cell)
room ambient sensor C (located on the display board)
The wires leading from sensors A and B are encapsulated in foam inside the cabinet. As a result, these
sensors are not replaceable.
Sensor C is mounted on the display board.
Note:
The freezer air temperature sensor B is not used to control the appliance but only to display the freezer
compartment temperature.
6.3.b. Door switches
The battery evaporator defrosting is driven by the electronic board and depends also on the detection of the
opening of the cooler and freezer door by using:
magnetic switch for the cooler door control (located on the display board inserted into the work top)
button for the freezer door control (located on the left side of the cold module).
The magnetic switch for the cooler door control is activated by a magnet located inside the cooler door.
Note:
The cooler door button is located under the work top and controls only the switching on and off of the lamp.
cooler door button
freezer door button