Download SERVICE MANUAL COOKING

SERVICE MANUAL
COOKING
THIS DOCUMENT UPDATES AND REPLACES THE
PREVIOUS ONE WITH SAME NUMBER
© ELECTROLUX HOME PRODUCTS
Corso Lino Zanussi,30
I - 33080 PORCIA /PN (ITALY)
Tel +39 0434 394850
Fax +39 0434 394096
Publication
number
599 37 14-84
IT/SERVICE/FV
Built-in ovens and
Cookers
GENERAL
TROUBLESHOOTING
PROCEDURE
KRONOS
(OVC1000)
SOI
Edition: 03.2008 – Rev. 01
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CONTENTS
1 - INTRODUCTION ------------------------------------------------------------------------------------------page
1.1 - PURPOSE OF THIS MANUAL ---------------------------------------------------------------------------- page
1.2 - ESD--------------------------------------------------------------------------------------------------------------- page
4
2 - DIAGNOSTICS AND APPROACH TO THE SYSTEM ------------------------------------------page
2.1 - ERROR CODE DISPLAY ----------------------------------------------------------------------------------- page
2.2 - MEMORISATION OF ERROR CODES ----------------------------------------------------------------- page
5
3 - GENERAL BLOCK DIAGRAM------------------------------------------------------------------------page
6
4 - ERROR CODES-------------------------------------------------------------------------------------------page
7
5 - TROUBLESHOOTING WITH ERROR CODE ON NORMAL OVENS-----------------------page
8
4
4
6
6
6 - TROUBLESHOOTING WITHOUT ERROR CODE ON NORMAL OVENS ----------------page 10
7 - TROUBLESHOOTING WITH ERROR CODE ON PYRO OVENS ---------------------------page 17
8 - TROUBLESHOOTING WITHOUT ERROR CODE ON PYRO OVENS ---------------------page 20
9 - VARIANT FOR MODELS WITH LIGHT BAR------------------------------------------------------page 25
10 - DIAGNOSTICS CYCLE --------------------------------------------------------------------------------page 26
9.1 - DIAGNOSTICS ON LEVEL 2 CONTROL UNIT NORMAL ----------------------------------------- page 26
9.2 - DIAGNOSTICS ON LEVEL 2 CONTROL UNIT PYRO---------------------------------------------- page 28
9.3 - DIAGNOSTICS ON LEVEL 3 CONTROL UNIT NORMAL ----------------------------------------- page 31
9.4 - DIAGNOSTICS ON LEVEL 3 CONTROL UNIT PYRO---------------------------------------------- page 33
11 - FUNCTIONAL DIAGRAMS ----------------------------------------------------------------------------page 36
11.1 - FUNCTIONAL DIAGRAMS NORMAL OVEN ------------------------------------------------page 36
11.1.1 - FUNCTIONAL DIAGRAM LEVEL 2 NORMAL OVEN ------------------------------------------- page 36
11.1.2 - FUNCTIONAL DIAGRAM LEVEL 2 NORMAL OVEN WITH LIGHT BAR ------------------ page 37
11.1.3 - FUNCTIONAL DIAGRAM LEVEL 3 NORMAL OVEN ------------------------------------------- page 39
11.2 - FUNCTIONAL DIAGRAMS PYROLYTIC OVEN -------------------------------------------page 40
11.2.1 - FUNCTIONAL DIAGRAM LEVEL 2 PYROLYTIC OVEN --------------------------------------- page 40
11.2.2 - FUNCTIONAL DIAGRAM LEVEL 2 PYROLYTIC OVEN WITH LIGHT BAR-------------- page 41
11.2.3 - FUNCTIONAL DIAGRAM LEVEL 3 PYROLYTIC OVEN --------------------------------------- page 43
12 - TESTS ON COMPONENTS----------------------------------------------------------------------------page 39
12.1 - TESTING THE TEMPERATURE SENSOR --------------------------------------------------------------- page 39
12.2 - TESTING THE POWER ABSORPTION ------------------------------------------------------------------- page 40
12.3 - TESTING THE POWER BOARD ---------------------------------------------------------------------------- page 40
12.4 - RELEASING THE DOOR MANUALLY --------------------------------------------------------------------- page 41
12.4.1 - RELEASING THE DOOR MANUALLY ON ACCESS OVENS -------------------------------- page
12.4.2 - RELEASING THE DOOR MANUALLY ON ACCESS PLUS OVENS ----------------------- page
12.4.2.1 - HOLE POSITION ON MODELS WITH TRADITIONAL DOOR OPENING AND
LEFT HINGED DOOR -------------------------------------------------------------------------- page
12.4.2.2 - HOLE POSITION ON MODELS WITH RIGHT HINGED DOOR ---------------------- page
12.4.2.3 - RELEASING THE “METEOR” DOOR LOCK ----------------------------------------------- page
12.4.2.4 - RELEASING THE “ELTEK” DOOR LOCK -------------------------------------------------- page
12.5 - TESTING THE DOOR LOCK --------------------------------------------------------------------------------- page
46
47
47
47
48
48
49
13 - ACCESS/KRONOS: ORGANIZATION OF SERVICE MANUALS ---------------------------page 50
14 - REVISIONS-------------------------------------------------------------------------------------------------page 51
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1 - INTRODUCTION
This troubleshooting procedure for the KRONOS system is intended to be used with reference to the
basic information contained in the theoretical Service Manual (code 599 37 14 83), with the addition of
flow charts, block diagrams and referring to any error codes that might be shown on the display.
1.1 - PURPOSE OF THIS MANUAL
The purpose of this Manual is to provide a general outline of an efficient troubleshooting procedure for the
new KRONOS system.
This Manual contains the general information necessary to perform the troubleshooting procedure.
In relation to the various applications / personalizations, a brief Service Note will be issued describing the
differences between the various applications.
1.2 - ESD - ELECTROSTATIC DISCHARGE AND ITS EFFECT ON THE COMPONENTS
The interface for the control unit is not fitted with an internal device to protect against electrostatic
discharge. When effecting repairs, therefore, the service engineer must check for stabilization of the
potential on the oven casing (i.e. discharge any static electricity by touching the oven casing) in order to
prevent the possibility of overload, which might damage the control unit.
The same care is necessary when handling control units supplied as spare parts (i.e. not yet fitted to the
oven), which must be removed from the protective bag in ESD only after stabilizing the potential (i.e.
discharging any static electricity) and only then installed in the appliance.
Important: The theory behind the process of electrostatic charge and discharge is not discussed in this
Manual, since the tangible effects are considered to be more important. However, the effects are felt
frequently when touching a metal handle and feeling the electrostatic discharge in the form of a minor
shock.
But what happens when stabilization of the potential takes place with semi-conductor components (i.e.
components on a circuit board, such as integrated circuits, microprocessors etc.)?
Stabilization of the potential takes place across the internal structure of the component. This does not
necessarily lead to the immediate destruction of the component; subsequent malfunctions across
damaged internal connections may be more harmful, and these occur only as a result of overheating or
current overloads.
It is true that almost all sensitive semi-conductor components (such as MOS circuits) have been improved
by the addition of protective measures, but the internal structures of these components are today smaller
than, for example, ten years ago, which tends to increase their sensitivity to the previous levels.
Important!
Which components are susceptible to damage by static electricity during repairs?
All circuit boards featuring accessible control and command connections (door switches, food probes
etc.), bare tracks and microprocessors, as well as any other circuits with free access.
Examples:
-
Programmers with accessible connections for the food probe and the door switch.
Programmers whose control processors are accessible (due to their high costs, the protective systems
are only partial).
W.O.E.C. control units.
S.O.E.C. control units.
C.H.E.C. control units.
-
KRONOS control units
R.H.E.A control units.
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2 - DIAGNOSTICS AND APPROACH TO THE SYSTEM
In view of the diversified nature and the flexibility of the system, it is necessary to adopt a method of
approach to each specific type of fault.
In other words, it is important to identify in detail the phenomena that take place when a fault occurs by
attempting to correctly interpret the user's complaint.
For example, if the user makes a service call because the "oven is off", this may be due to:
-
The oven does not switch on.
The oven switches on for a few moments and then switches off.
The display is lit but the oven does not heat.
Even in an oven with a traditional programming system, these three phenomena require three different
approaches to locating the fault.
In a more complex system such as Kronos, it is even more important to correctly interpret the
phenomena that occur.
In order to facilitate the process of identification, it is necessary to subdivide the system into separate
blocks and then to identify the block in which the fault has occurred.
A first classification may be as follows:
OVEN
MALFUNCTION
FAULT WITH
INDICATION OF AN
ERROR CODE
FAULT WITHOUT
INDICATION OF AN
ERROR CODE
Fig. 1
If the fault is accompanied by an error code, it is easier to identify.
As explained in greater detail in sections 5, 7 and 9, the appearance of an error code indicates a situation
that has been detected by the system.
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2.1 – ERROR CODE DISPLAY
The normal flow of information governed by the microcontroller is monitored by an internal programme; in
the event of certain malfunctions, the relative information is shown on the display in the form of an error
code.
2.2 – MEMORISATION OF ERROR CODES
The data relative to the error code are memorized in one of the registers in the microcontroller.
When an error code is displayed, the oven switches off. To reset the error code, switch the oven off and
then on.
3 - GENERAL BLOCK DIAGRAM
In order to facilitate troubleshooting, especially when no error code is displayed, it may be useful to
represent the system in the form of a block diagram.
Fig. 2
1 - User interface (control units 1, 2 and 3)
2 - Power board OVC1000
3 - Input devices (sensors)
4 - Output devices (power loads)
-
The user interfaces (1) are the various control units including the control interfaces (if present).
The power board receives information from the control units and signals from the input devices (3) in order to
control the output devices (4).
The input devices are sensors which transfer to the system any variations in temperature, as well as thermostats
(in some models) which guarantee user safety in case of overheating.
Out devices include the heating elements, the oven light and the various motors (oven fans, rotary spits, and if
present, the door lock).
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4 - ERROR CODES
The KRONOS system performs an internal autodiagnostics routine and, when a malfunction is detected,
displays the corresponding error code.
The error code is shown on the display as shown in the figures relative to the various levels (see figg. 3,
4).
The table below describes the various error codes:
ERROR CODE
F02
F03
F04
F05
F08
F09
F10
DESCRIPTION OF THE CAUSE
Door lock system
(featured only on pyrolytic ovens).
EEPROM Memory on Control Unit.
Oven sensor temperature range exceeded
(condition occurs for more than 5 seconds).
Temperature safety limit exceeded
> 350°C on normal ovens.
> 530°C on pyrolytic ovens.
(condition occurs for more than 10 seconds).
Communication interruption between Control unit and
power board.
Software compatibility between Control unit and power
board.
Faulty triac (on power board)
Examples of the way in which error codes are displayed are shown below:
Example of error code (F05) on level 2 control unit
Fig. 3
Example of error code (F05) on level 3 control unit
Fig. 4
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5 - TROUBLESHOOTING USING ERROR CODES ON NORMAL OVENS
Troubleshooting based on error codes helps to identify the component or a specific section of the circuitry in the
appliance.
When a malfunction is detected by the control circuit, the appliance shows the error code on the display and then
switches off.
Condition
Control
Result
Cause
Solution
EEPROM Memory
On control board
(display)
faulty.
Replace the
control board
(display).
Resistance is 520 570 Ω depending
on the room
temperature (refer
to S.M.
599371483 page 17.
Power board
faulty
Replace the
board.
Temperature
sensor shortcircuited or
interrupted.
Temperature
sensor faulty.
Replace the
temperature
sensor.
Error code
F03
(EEPROM
Memory
faulty).
Error code
F04
(temperature
sensor shortcircuited).
Error code
F05
(temperature
safety limit
exceeded)
SOI 03.08 FV
Measure the
resistance of
the temperature
sensor.
When the oven
is cold, switch it
on and then off
to reset the
error code, then
check power
absorption in
the oven lamp
function (refer
to page 38).
Power absorption is
less than about
50W.
Fixing and
position of the
temperature
sensor.
Position or
Fixing not correct.
Fastening screw
not tightened.
Position and
Fix the
temperature
sensor
correctly.
Power absorption
is more than 50W.
Relay on power
board faulty.
Replace the
power board.
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Condition
Error code
F08
(No
communicatio
n between
display board
and power
board).
Error code
F09
(Software
wrong)
Error code
F10
(Triac on
power
board
faulty).
Control
Check the
continuity of the
connection
between the
control board
(display) and
the power
board.
Check if the
board replaced
is indicated in
the relative
spare part
catalogue.
Detach the
power loads
from the triac of
the power
board one by
one checking if
error F10
disappears.
Resistance
check of the
detached load.
SOI 03.08 FV
Result
Cause
Solution
Correct
connection.
Control board
(display) faulty.
Replace the
control board
(display).
No correct
correction.
False contacts on
the connection
connectors.
Repair the
connection.
No correct board.
Wrong error code.
Use the
correct board.
The board seems
correct.
Software inside the
board is not
compatible.
Use the correct
board.
Power board
faulty
Replace the
board
Meas. of the
resistance correct.
Power board
faulty
Replace the
board
Meas. of the
resistance not
correct
Load detached
and power board
faulty.
Replace the
load detached
(motor or lamp)
and the power
board.
The error code F10
disappears.
The error code F10
disappears.
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6 - TROUBLESHOOTING WITHOUT ERROR CODES
Condition
The oven
operates for a
short time, then
switches off
Control
Perform the
diagnostics
cycle
(see pages 26 31)
Check the
winding of the
cooling fan for
continuity
Result
Perform the
diagnostics
cycle
(see pages 26 31)
Check the
winding of the
convection fan
for continuity
Continuity
Power board
faulty
Replace the
board
Cooling fan faulty
Replace the
cooling fan
The convection fan
does not switch on
Power board
faulty
Continuity
Convection fan
faulty
No continuity
SOI 03.08 FV
Solution
The cooling fan
does not switch on
No continuity
Poor cooking
results in "fan
cooking" mode
(i.e. using the
convection fan)
Cause
10/51
Replace the
board
Replace the
convection fan
599 37 14-84
Condition
In functions
where it is
used, the spit
motor does not
start
Control
Perform the
diagnostics
cycle
(see pages 26 31)
Check the
winding of the
spit motor for
continuity
Result
Cause
Solution
Continuity
Power board
faulty
Replace the
board
No continuity
Spit motor faulty
The spit motor
does not switch on
Replace the
spit motor
When the oven
is switched on,
the cooling fan
starts
immediately
Perform the
diagnostics
cycle
(see pages 26 31)
The cooling fan
starts immediately
Power board
faulty
Replace the
board
When the oven
is switched on,
the convection
fan starts
immediately
Perform the
diagnostics
cycle
(see pages 26 31)
The convection fan
starts immediately
Power board
faulty
Replace the
board
When the oven
is switched on,
the spit motor
starts
immediately
Perform the
diagnostics
cycle
(see pages 26 31)
The spit motor
starts immediately
Power board
faulty
Replace the
board
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Condition
The oven lamp
does not light
when the oven
is switched on
Control
Check for
ohmic
continuity of the
oven lamp
Result
Cause
Solution
Power board
faulty
Replace the
board
Oven lamp faulty
Replace the
oven lamp
Power cable
faulty.
Replace the
power
cable.
No mains power
at the power
socket.
Check the
electrical
power circuit.
The resistance is
more than 2
KΩ or less than 1
KΩ.
Power board
faulty.
Replace the
power board.
The resistance is
between 1KΩ and
2 KΩ.
Control/Display
board faulty.
Replace the
board.
Wiring.
Check the
wiring.
No continuità.
Thermostat TC1
Faulty.
Replace the
thermostat.
Continuità.
Power board
faulty.
Replace the
power board.
Continuity (from
150 to 400 Ω)
Circuit open
∞ (infinite)
The oven is
completely
switched off
Check for
power supply to
the terminal
block.
No power supply
Power supply OK
Disconnect the
appliance from
the power supply
and perform the
test on the power
board (see page
43)
The display
operates but
the oven does
not heat in any
function.
SOI 03.08 FV
Check the
continuity of the
safety
thermostat TC1.
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Condition
Control
Result
Certain keys
do not send
the correct
signal.
Perform the
diagnostics
routine
(see pages 26 31).
When the keys are
pressed in
sequence, the
action shown in the
diagnostics cycle is
not performed.
Check that the
board is
correctly
mounted on the
control panel so
that the
mechanical
action of the
keys is correct.
Mechanical
action OK
Mechanical
action incorrect
Cause
Solution
Control/Display
board faulty
Replace the
board
Assembly of
control/display
board and control
panel
Fit the board
correctly
When the keys are
pressed in
sequence, the
action is as shown
in the diagnostics
cycle.
(see page 23 & 28)
SOI 03.08 FV
Select the "beep
when pressed"
function and
press all the
keys in
sequence.
Some of the keys
do not emit a
"beep".
Check that the
board is
correctly
mounted on the
control panel so
that the
mechanical
action of the
keys is correct.
Mechanical
action OK.
Control/Display
board faulty
Replace the
board
Mechanical
action incorrect.
Assembly of
control/display
board and control
panel
Fit the board
correctly
All the keys emit
a "beep" when
pressed.
Incorrect version
of the
control/display
board (software
incompatible)
13/51
Replace the
control/display
board with the
correct version
for the appliance
599 37 14-84
Condition
Control
Some control
zones do not
send the
signal (only
for Touch
models).
Perform the
diagnostics
routine
(see page 26 31).
Result
2
Solution
Activating the
sequence of the
control zones, the
action shown in the
diagnostics cycle is
not performed
(see page 25).
Check that the
sensor board is
correctly
mounted on the
control panel so
that they
adhere
perfectly
The adherence
board – control
panel is correct
Check that the
connection of
the Control Unit
– Sensor Board
wiring is correct
The connection is
correct
Perform the
key test
directly on the
Control Unit.
(see specific
Manual).
The test is
positive
The test is
negative
1
Cause
Wiring
connection
Sensor board –
Control Unit not
correct.
Repair or
replace the
wiring
Sensor board
assy faulty
Replace the
Sensor board
assembly
Control Unit
faulty
Replace the
Control Unit
3
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Condition
1
2
Control
Result
Cause
Solution
3
The wiring
connection
Control Unit –
Sensor board is
not correct.
The wiring
connection
Control Unit –
Senspr board is
not correct.
Repair or
replace the
wiring.
The adherence
Sensor board –
control panel is
not correct.
Sensor board –
control panel assy
faulty.
Replace the
board – control
panel assembly.
Activating the
sequence of the
control zones, the
action shown in the
diagnostics cycle is
not performed.
(see page 26 -31).
Select the "beep
when pressed"
function and
press all the
control zones in
sequence.
Perform the
key test directly
on the Control
Unit.
(see specific
Manual).
SOI 03.08 FV
Some of the zones
do not emit a
"beep".
Wiring
connection of
Sensor board –
Control Unit is
not correct.
Repair and
replace the
wiring.
Sensor board
assembly faulty.
Replace the
Sensor board
assy.
The test is
negative.
Control Unit
faulty.
Replace the
Control Unit.
All the control
zones emit a
“beep” when
activated.
Wrong code of
the control/display
board (software
not compatible).
The test is
positive.
15/51
Replace the
control/display
board with the
one relative to
the model.
599 37 14-84
Condition
Certain sections
of the display
do not light.
SOI 03.08 FV
Control
Perform the
diagnostics
routine
(see pages 26 31).
Result
Cause
Solution
All sections of the
display light
correctly.
Incorrect version of
the control/display
board (software
incompatible).
Replace the
control/display
board with the
correct version
for the appliance.
Certain sections
of the display do
not light.
Control/display
board faulty.
Replace the
board.
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7 - TROUBLESHOOTING USING ERROR CODES ON PYROLYTIC OVENS
Troubleshooting based on error codes helps to identify the component or a specific section of the circuitry in the
appliance.
When a malfunction is detected by the control circuit, the appliance shows the error code on the display and then
switches off.
Condition
Control
Error code
F02
(Door lock
faulty).
Perform the
diagnostics
cycle (see
pages 28 and
33).
Result
SOI 03.08 FV
Ohmic measure
of the
temperature
sensor.
Result
The door does not
lock and unlock
correctly.
Door lock faulty.
Replace the
door lock.
The door locks
and unlocks
correctly.
False contacts
on the wiring.
Repair the
false contacts
on the wiring.
EEPROM memory
On the control
board (display)
faulty.
Replace the
control board
(display).
Resistance is 520 570 Ω depending
on the room
temperature (refer to
S.M.
599371483 page 17.
Power board
faulty.
Replace the
power board.
Temperature sensor
short-circuited or
interrupted.
Temperature
sensor faulty.
Replace the
temperature
sensor.
Error code
F03
(EEPROM
Memory
faulty).
Error code
F04
(Temperature
sensor shortcircuited or
interrupted).
Cause
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Condition
Error code
F05
(temperature
safety limit
exceeded
+ overheating
detected)
Control
Result
Cause
Solution
Perform the
diagnostics
cycle
(see pages 28
and 33).
The door does not
lock and unlock
correctly.
Perform the
test of the door
lock
(see door lock
test page 41)
Test resulted
negative.
Door lock faulty.
Replace door
lock.
Test resulted
positive.
Power board
faulty.
Replace
power board.
The door locks and
unlocks correctly.
SOI 03.08 FV
When the oven
is cold, switch it
on and then off
to reset the
error code, then
check power
absorption in
the oven lamp
function (refer
to page 45).
Power absorption is
less than about
50W.
Fastening and
position of the
temperature
sensor.
Fastening or
position
incorrect.
Fastening screw
not tightened.
Position and
correctly
fasten the
temperature
sensor.
Power absorption
is more than about
50W.
Relay on power
board faulty.
Replace the
power board.
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599 37 14-84
Condition
Error codeF08
(No
communicatio
n between
display board
and power
board).
Error code
F09
(Software
wrong)
Error code
F10
(Triac on
power
board
faulty).
SOI 03.08 FV
Control
Check the
continuity of the
connection
between the
control board
(display) and
the power
board.
Check that the
board to be
replaced is
indicated on the
relative spare
part catalogue.
Result
Cause
Solution
Correct
connection.
Control board
(display) faulty.
Replace the
control board
(display).
Incorrect
connection.
False contacts on
the connectors.
Repair the
connection.
Board not correct.
Wrong error code.
Use the
correct board.
Board seems
correct.
Software inside the
board is not
compatible.
Use the correct
board.
Detach the
loads on the of
the power
board one by
one checking if
error F10
disappears.
Error code F10
disappears.
Ohmic control
of the
detached
load.
Ohmic measure
correct.
Power board
faulty.
Replace the
board.
Ohmic measure
incorrect.
Detached load and
power board faulty.
Replace the
detached load
(motor or lamp)
and the power
board.
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599 37 14-84
8 - TROUBLESHOOTING WITHOUT ERROR CODES ON PYROLYTIC OVENS
Condition
The oven
operates for a
short time, then
switches off.
Control
Result
Perform the
diagnostics
cycle
(see pages 28
and 33).
The cooling fan
does not switch on.
Check the
winding of the
cooling fan for
continuity.
Continuity
No continuity
Poor cooking
results in "fan
cooking" mode
(i.e. using the
convection fan)
Perform the
diagnostics
cycle
(see pages 28
and 33).
Check the
winding of the
convection fan
for continuity.
The oven
operates for a
short time with
the pyrolysis
cycle, then
switches off.
SOI 03.08 FV
Check the
cooling fan at
high speed.
Cause
Solution
Heating element
RL faulty.
Replace the
heat. element
RL
Power board
faulty.
Replace the
board.
Cooling fan faulty.
Replace the
cooling fan.
The convection fan
does not switch on.
Power board
faulty.
Replace the
board.
No continuity
Cooling fan faulty.
Replace the
cooling fan.
The cooling fan
does not work at
high speed.
Triac TO4 on the
power board faulty.
Replace the
board.
Continuity
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599 37 14-84
Condition
When the oven
is switched on,
the cooling fan
starts
immediately.
Control
Result
Perform the
diagnostics
cycle
(see pages 28
and 33).
The cooling fan
starts immediately.
The cooling fan
remains on
also when the
oven is cold.
When the oven
is switched on,
the convection
fan starts
immediately.
Perform the
diagnostics
cycle
(see pages 28
and 33).
When the oven
is switched on,
the oven lamp
does not switch
on
Check the oven
lamp for ohmic
continuity.
The convection fan
starts immediately.
Continuity
(from 150 to 400
Ω)
Open circuit
∞ (infinite)
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Cause
Solution
Power board
faulty.
Replace the
board.
Power board
faulty.
Replace the
board.
Power board
faulty.
Replace the
board.
Power board
faulty.
Replace the
board.
Oven lamp faulty.
Replace the
lamp.
599 37 14-84
Condition
Control
The oven is
completely
switched off.
Check for
power supply to
the terminal
block.
Disconnect the
appliance from
the power supply
and perform the
test on the power
board (see page
45).
The display
operates but
the oven does
not heat in any
function.
SOI 03.08 FV
Check the TC1
safety
thermostat for
continuity.
Result
Cause
Solution
No power
supply.
Power cable
faulty.
Replace the
power cable.
Power supply OK.
No mains power
at the power
socket.
Check the
electrical
power circuit.
The resistance is
more than 2
KΩ or less than 1
KΩ.
Power board
faulty.
Replace the
board.
The resistance is
between 1KΩ and
2 KΩ.
Control/Display
board faulty.
Replace the
board
Wiring
connections
faulty.
Repair the
wiring.
No continuity.
Thermostat TC1
faulty.
Replace the
thermostat.
Continuity.
Power board
faulty.
Replace the
board.
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599 37 14-84
Condition
Control
Certain keys
do not send
the correct
signal.
Perform the
diagnostics
routine
(see pages 28
and 33).
Result
Cause
Solution
When the keys are
pressed in sequence,
the action shown in
the diagnostics cycle
is not performed
(see pages 28 and
33)
Check that the
board is
correctly
mounted on the
control panel so
that the
mechanical
action of the
keys is correct
Mechanical
action OK.
Control/Display
board faulty.
Replace the
board.
Mechanical
action incorrect.
Assembly of
control/display
board and control
panel.
Fit the board
correctly.
Mechanical
action OK.
Control/Display
board faulty.
Replace the
board.
Mechanical
action incorrect.
Assembly of
control/display
board and control
panel.
Fit the board
correctly.
All the keys emit
a "beep" when
pressed.
Incorrect version
of the
control/display
board (software
incompatible).
Replace the
control/display
board with the
correct version
for the
appliance.
When the keys are
pressed in
sequence, the
action is as shown
in the diagnostics
cycle. (see pages
28 and 33).
Select the "beep
when pressed"
function and
press all the
keys in
sequence.
Check that the
board is
correctly
mounted on the
control panel so
that the
mechanical
action of the
keys is correct.
SOI 03.08 FV
Some of the keys
do not emit a
"beep".
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599 37 14-84
Condition
Certain sections
of the display
do not light.
Selecting a
function, the
oven does not
start.
(It does not
heat)
SOI 03.08 FV
Control
Perform the
diagnositcs
cycle
(see pages 28
and 33).
Check the door
lock.
(see page 49)
Result
Cause
Solution
All sections of the
display light
correctly.
Incorrect version of
the control/display
board (software
incompatible).
Replace the
control/display
board with the
correct version
for the appliance.
Certain sections
of the display do
not light.
Control/display
board faulty.
Replace the
board.
The test resulted
negative.
Door lock faulty.
Replace the
door lock.
The test resulted
positive.
Power board
faulty.
Replace the
board.
Connection
wiring door lock
with board.
(Connector Pos.
RS02).
Check wiring.
24/51
599 37 14-84
9 - VARIANT FOR MODELS WITH LIGHT BAR
The troubleshooting part below is dedicated to the light bar and the relative control board featured only on
some models.
Condition
Control
The light bar
does not light
up.
Are the power
connections to
the Light Bar
interface board
correct?
Result
The connections
are correct.
Cause
False contacts or
faston not inserted
correctly.
Solution
Repair the
connections.
The connections
are correct.
Disconnect the
connection cable
Light bar
interface boardControl unit.
The bar lights up.
Are the
connection
cables between
Light Bar
interface board
and light bar
correct?
Check the
efficiency of
both Leds.
SOI 03.08 FV
Control unit faulty.
Replace the
Control unit.
The connections
are correct.
False contacts or
faston not inserted
correctly.
Repair the
connections.
The connections
are correct.
Control unit faulty.
At least one of the
Leds is faulty.
Light bar assembly
faulty.
Replace the light
bar assembly.
The LEDs are ok.
Light bar interface
board faulty.
Replace the
Light bar
interface board.
The bar does not
light up.
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599 37 14-84
10 - DIAGNOSTICS CYCLE
10.1 - DIAGNOSTICS LEVEL 2 CONTROL UNIT NORMAL
To activate the diagnostics cycle in the base version it is necessary:
simultaneously within some seconds after the switching on:
Press buttons FHU and
The test has the following sequence:
Switching on
Fig. 5
Activation of the test
Fig. 6
Displaying of the display segments
Fig. 7
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599 37 14-84
Displaying of the programme code
Fig. 8
Sensor temperature (25)
Fig. 9
Power and auxiliary loads test
Fig. 10
End of test
Fig. 11
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10.2 - DIAGNOSTICS LEVEL 2 CONTROL UNIT PYRO
To activate the diagnostics cycle in the base version it is necessary:
Press buttons FHU and
simultaneously within some seconds after the switching on:
The test has the following sequence:
Switching on
Fig. 12
Activation of the test
Fig. 13
Displaying of the display segments
Fig. 14
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599 37 14-84
Displaying of the programme code
Fig. 15
Door closed not locked (02) Sensor temperature (25)
Fig. 16
Door open not locked (02) Sensor temperature (25)
Fig. 17
Door locked
Fig. 18
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Power and auxiliary loads test
Fig. 19
Door lock deactivated
Fig. 20
End of test
Fig. 21
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10.3 - DIAGNOSTICS LEVEL 3 CONTROL UNIT NORMAL
To activate the diagnostics cycle in the base version it is necessary:
Press buttons FHU and
simultaneously within some seconds after the switching on:
The test has the following sequence:
Switching on
Fig. 22
Activation of the test
Fig. 23
Displaying of the display segments
Fig. 24
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Displaying of programme code and Sensor temperature (25)
Fig. 25
Power and auxiliary loads test
Fig. 26
End of test
Fig. 27
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10.4 - DIAGNOSTICS LEVEL 3 CONTROL UNIT PYRO
To activate the diagnostics cycle in the base version it is necessary:
simultaneously within some seconds after the switching on:
Press buttons FHU and
The test has the following sequence:
Switching on
Fig. 28
Activation of the test
Fig. 29
Displaying of the display segments
Fig. 30
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599 37 14-84
Displaying of programme code and Sensor temperature (25)
Fig. 31
Door closed not locked (00)
Fig. 32
Door open not locked (02)
Fig. 33
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End of test
Fig. 34
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11 - FUNCTIONAL DIAGRAMS
11.1 - FUNCTIONAL DIAGRAMS NORMAL OVEN
11.1.1 - FUNCTIONAL DIAGRAM LEVEL 2 NORMAL OVEN
Fig. 35
KEY
DISPLAY L2 - KRONOS CONTROL UNIT
LEVEL 2.
Ground
- MAINS (EARTH).
L1
- OVEN LAMP.
MG1
- CONVECTION FAN
MG2
- TANGENTIAL COOLING FAN.
MG3
- SPIT MOTOR
Neutral
- MAINS (NEUTRAL).
Phase
- RETE (FASE).
RT1
- OVEN SENSOR PT500.
R1
- GRILL HEATING ELEMENT.
R2
- LOWER HEATING ELEMENT
(BOTTOM).
R3
- UPPER HEATING ELEMENT
(CEILING).
R4
- CONVECTION HEATING ELEMENT
(CIRCULAR).
OVC1000
- POWER BOARD.
REL1
- SAFETY MAIN RELAY.
SOI 03.08 FV
REL2
REL3
REL4
REL5
TC1
TO1
TO2
TO3
TO4
TO5
TR01
- CONTROL RELAY FOR CONVECTION
HEATING ELEMENT.
- CONTROL RELAY FOR UPPER HEATING
ELEMENT.
- CONTROL RELAY FOR GRILL HEATING
ELEMENT.
- CONTROL RELAY FOR LOWER
HEATING ELEMENT.
- SAFETY THERMOSTAT.
- CONTROL TRIAC FOR OVEN LAMP.
- CONTROL TRIAC FOR CONVECTION
FAN.
- CONTROL TRIAC FOR TANGENTIAL
COOLING FAN.
- CONTROL TRIAC FOR SPIT MOTOR
- CONTROL TRIAC FOR DOOR
INTERLOCK
- LOW-POWER TRANSFORMER
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599 37 14-84
11.1.2 - FUNCTIONAL DIAGRAM LEVEL 2 NORMAL OVEN WITH LIGHT BAR
Fig. 13
Fig. 36
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599 37 14-84
KEY
DISPLAY L2 - KRONOS CONTROL UNIT
LEVEL 2.
Ground
- MAINS (EARTH).
L1
- OVEN LAMP.
LEDBAR
- LIGHT-BAR ASSEMBLY.
M1
- CONVECTION FAN
M2
- TANGENTIAL COOLING FAN.
NEUTRAL
- MAINS (NEUTRAL).
OVC1000
- POWER BOARD.
PHASE
- MAINS (PHASE).
Pt500
- OVEN SENSOR PT500.
PSU
- LIGHT-BAR INTERFACE BOARD
R1
- GRILL HEATING ELEMENT.
R2
- LOWER HEATING ELEMENT
(BOTTOM).
R3
- UPPER HEATING ELEMENT
(CEILING).
R4
- CONVECTION HEATING ELEMENT
(CIRCULAR).
REL1
- SAFETY MAIN RELAY.
SOI 03.08 FV
REL2
- CONTROL RELAY FOR CONVECTION
HEATING ELEMENT.
REL3
- CONTROL RELAY FOR UPPER HEATING
ELEMENT.
REL4
- CONTROL RELAY FOR GRILL HEATING
ELEMENT.
REL5
- CONTROL RELAY FOR LOWER HEATING
ELEMENT.
SENSOR PCB - SENSOR INTERFACE BOARD.
Th1
- SAFETY THERMOSTAT.
TO1
- CONTROL TRIAC FOR OVEN LAMP.
TO2
- CONTROL TRIAC FOR CONVECTION FAN.
TO3
- CONTROL TRIAC FOR TANGENTIAL
COOLING FAN.
TO4
- CONTROL TRIAC FOR SPIT MOTOR (NOT
USED)
TO5
- CONTROL TRIAC FOR DOOR INTERLOCK
(NOT USED)
TR01
- LOW-POWER TRANSFORMER
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11.1.3 - FUNCTIONAL DIAGRAM LEVEL 3 NORMAL OVEN
Fig. 37
KEY
DISPLAY L3 - KRONOS CONTROL UNIT
LEVEL 3.
Ground
- MAINS (EARTH).
L1
- OVEN LAMP.
MG1
- CONVECTION FAN
MG2
- TANGENTIAL COOLING FAN.
MG3
- SPIT MOTOR
Neutral
- MAINS (NEUTRAL).
Phase
- RETE (FASE).
RT1
- OVEN SENSOR PT500.
R1
- GRILL HEATING ELEMENT.
R2
- LOWER HEATING ELEMENT
(BOTTOM).
R3
- UPPER HEATING ELEMENT
(CEILING).
R4
- CONVECTION HEATING ELEMENT
(CIRCULAR).
OVC1000
- POWER BOARD.
REL1
- SAFETY MAIN RELAY.
SOI 03.08 FV
REL2
REL3
REL4
REL5
TC1
TO1
TO2
TO3
TO4
TO5
TR01
- CONTROL RELAY FOR CONVECTION
HEATING ELEMENT.
- CONTROL RELAY FOR UPPER HEATING
ELEMENT.
- CONTROL RELAY FOR GRILL HEATING
ELEMENT.
- CONTROL RELAY FOR LOWER
HEATING ELEMENT.
- SAFETY THERMOSTAT.
- CONTROL TRIAC FOR OVEN LAMP.
- CONTROL TRIAC FOR CONVECTION
FAN.
- CONTROL TRIAC FOR TANGENTIAL
COOLING FAN.
- CONTROL TRIAC FOR SPIT MOTOR
- CONTROL TRIAC FOR DOOR
INTERLOCK
- LOW-POWER TRANSFORMER
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599 37 14-84
11.2 - FUNCTIONAL DIAGRAM PYROLYTIC OVEN
11.2.1 - FUNCTIONAL DIAGRAM LEVEL 2 PYROLYTIC OVEN
Fig. 38
KEY
DISPLAY L2 - KRONOS CONTROL UNIT
LEVEL 2.
DL
- DOOR INTERLOCK ASSY
Ground
- MAINS (EARTH).
L1
- OVEN LAMP.
MG1
- CONVECTION FAN
MG2
- TANGENTIAL COOLING FAN.
MG3
- SPIT MOTOR
Neutral
- MAINS (NEUTRAL).
Phase
- RETE (FASE).
RT1
- OVEN SENSOR PT500.
R1
- GRILL HEATING ELEMENT.
R2
- LOWER HEATING ELEMENT
(BOTTOM).
R3
- UPPER HEATING ELEMENT
(CEILING).
R4
- CONVECTION HEATING ELEMENT
(CIRCULAR).
OVC1000
- POWER BOARD.
REL1
- SAFETY MAIN RELAY.
REL3
- CONTROL RELAY FOR UPPER
HEATING ELEMENT.
REL5
- CONTROL RELAY FOR LOWER
HEATING ELEMENT.
SOI 03.08 FV
REL2
REL4
RL
SW1
SW2
TC1
TC2
TO1
TO2
TO3
TO4
TO5
TR01
- CONTROL RELAY FOR CONVECTION
HEATING ELEMENT.
- CONTROL RELAY FOR GRILL HEATING
ELEMENT.
- FAN HEATING ELEMENT (DOUBLE
SPEED)
- MICROSWITCH DOOR INTERLOCK.
- MICROSWITCH DOOR CLOSED.
- SAFETY THERMOSTAT.
- DOOR INTERLOCK THERMOSTAT
- CONTROL TRIAC FOR OVEN LAMP.
- CONTROL TRIAC FOR CONVECTION
FAN.
- CONTROL TRIAC FOR TANGENTIAL
COOLING FAN.
- CONTROL TRIAC FOR COOLING
TANGENTIAL FAN DOUBLE SPEED
- CONTROL TRIAC FOR DOOR
INTERLOCK
- LOW-POWER TRANSFORMER
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599 37 14-84
11.2.2 - FUNCTIONAL DIAGRAM LEVEL 2 PYROLYTIC OVEN WITH LIGHT BAR
Fig. 39
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599 37 14-84
KEY
DISPLAY L2 - KRONOS CONTROL UNIT
LEVEL 2.
Ground
- MAINS (EARTH).
L1
- OVEN LAMP.
LEDBAR
- LIGHT-BAR ASSEMBLY.
MG1
- CONVECTION FAN
MG2
- TANGENTIAL COOLING FAN.
NEUTRAL
- MAINS (NEUTRAL).
OVC1000
- POWER BOARD.
PHASE
- MAINS (PHASE).
Pt500
- OVEN SENSOR PT500.
PSU
- LIGHT-BAR INTERFACE BOARD
R1
- GRILL HEATING ELEMENT.
R2
- LOWER HEATING ELEMENT
(BOTTOM).
R3
- UPPER HEATING ELEMENT
(CEILING).
R4
- CONVECTION HEATING ELEMENT
(CIRCULAR).
RL
- DROP RESISTANCE FOR FAN
(DOUBLE SPEED).
REL1
- SAFETY MAIN RELAY.
REL2
- CONTROL RELAY FOR
CONVECTION HEATING ELEMENT.
SOI 03.08 FV
REL3
- CONTROL RELAY FOR UPPER HEATING
ELEMENT.
REL4
- CONTROL RELAY FOR GRILL HEATING
ELEMENT.
REL5
- CONTROL RELAY FOR LOWER HEATING
ELEMENT.
SENSOR PCB - SENSOR INTERFACE BOARD.
SW1
- MICROSWITCH DOOR INTERLOCK HOOK.
SW2
- MICROSWITCH DOOR INTERLOCK.
Th1
- SAFETY THERMOSTAT.
Th2
- DOOR LOCK THERMOSTAT
TO1
- CONTROL TRIAC FOR OVEN LAMP.
TO2
- CONTROL TRIAC FOR CONVECTION FAN.
TO3
- CONTROL TRIAC FOR TANGENTIAL COOLING
FAN.
TO4
- CONTROL TRIAC FOR COOLING TANGENTIAL
FAN DOUBLE SPEED
TO5
- CONTROL TRIAC FOR DOOR INTERLOCK
TR01
- LOW-POWER TRANSFORMER
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599 37 14-84
112.3 - FUNCTIONAL DIAGRAM LEVEL 3 PYROLYTIC OVEN
Fig. 38
KEY
DISPLAY L3 - KRONOS CONTROL UNIT
LEVEL 3.
DL
- DOOR INTERLOCK ASSY
Ground
- MAINS (EARTH).
L1
- OVEN LAMP.
MG1
- CONVECTION FAN
MG2
- TANGENTIAL COOLING FAN.
MG3
- SPIT MOTOR
Neutral
- MAINS (NEUTRAL).
Phase
- RETE (FASE).
RT1
- OVEN SENSOR PT500.
R1
- GRILL HEATING ELEMENT.
R2
- LOWER HEATING ELEMENT
(BOTTOM).
R3
- UPPER HEATING ELEMENT
(CEILING).
R4
- CONVECTION HEATING ELEMENT
(CIRCULAR).
OVC1000
- POWER BOARD.
REL1
- SAFETY MAIN RELAY.
REL3
- CONTROL RELAY FOR UPPER
HEATING ELEMENT.
REL5
- CONTROL RELAY FOR LOWER
HEATING ELEMENT.
SOI 03.08 FV
REL2
REL4
RL
SW1
SW2
TC1
TC2
TO1
TO2
TO3
TO4
TO5
TR01
- CONTROL RELAY FOR CONVECTION
HEATING ELEMENT.
- CONTROL RELAY FOR GRILL HEATING
ELEMENT.
- FAN HEATING ELEMENT (DOUBLE
SPEED)
- MICROSWITCH DOOR INTERLOCK.
- MICROSWITCH DOOR CLOSED.
- SAFETY THERMOSTAT.
- DOOR INTERLOCK THERMOSTAT
- CONTROL TRIAC FOR OVEN LAMP.
- CONTROL TRIAC FOR CONVECTION
FAN.
- CONTROL TRIAC FOR TANGENTIAL
COOLING FAN.
- CONTROL TRIAC FOR SPIT MOTOR
- CONTROL TRIAC FOR DOOR
INTERLOCK
- LOW-POWER TRANSFORMER
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599 37 14-84
12 - TESTING THE COMPONENTS
12.1 - TESTING THE OVEN TEMPERATURE SENSOR
In case of doubt regarding the correct operation of the oven temperature sensor, use an ohmmeter to
measure its resistance as follows.
Fig. 40
Fig. 39
The resistance should be approximately 500 - 600 ohm at room temperature.
It is important to measure the insulation resistance between the metal casing and each of the terminals,
which must be greater than 2 Mohm.
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12.2 - POWER ABSORPTION TESTS
The power absorption can be measured using the appropriate instrument (e.g. wattmeter), which should
be applied between the power supply and the appliance.
The table below also shows indicative values for the relative current absorption in the event that an
amperometric pincer is used for measurement.
POWER ABSORPTION
(W)
50
1700
2000
CURRENT ABSORPTION
(A)
0,20
7,40
8,70
NOTA: The values measured refer to a power supply voltage of 230 V.
12.3 - TESTING THE POWER BOARD
The continuity of the primary winding of the power transformer on the power board can be checked by
measuring the ohmic resistance on the power supply terminal block. The test points for the various types
of appliance are shown in fig. 41.
Fig. 41
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12.4 - RELEASING THE DOOR LOCK MANUALLY
If the door remains locked mechanically, it must be released manually. To do so, proceed as follows:
12.4.1 - RELEASING THE DOOR LOCK MANUALLY ON ACCESS OVENS
To release the door lock manually on Access ovens, it is necessary to remove the hook screw through a
hole on the venting grid:
1. Insert a 3mm Philips (cross-head) screwdriver through the hole and loosen the screw which secures
the latch of the lock.
2. Remove the screw which secures the latch; in the way, the latch can be raised to release the door
(see fig. 44).
3. Check that the door interlock functions correctly. If not, replace the interlock (see chapter 11.5).
Fig. 44
1 - 3mm PHILIPS (CROSS-HEAD) SCREWDRIVER
2 - HOLE FOR ACCESS TO RELEASE SCREW
When the door interlock is released for the first time, it is necessary to perforate the thin plastic film which
covers the hole next to the door interlock release screw (see fig. 43).
SCREW
HOLE
Fig. 45
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12.4.2 - RELEASING THE DOOR LOCK MANUALLY ON ACCESS PLUS OVENS
To release the door lock manually on Access Plus ovens, it is necessary to remove the hook screw or to
lift up the hook (depending on the door interlock, see 12.4.2.3 and 12.4.2.4) through a hole on the oven
front panel.
12.4.2.1 - HOLE POSITION ON MODELS WITH TRADITIONAL OPENING DOOR AND LEFT HINGED DOOR
Fig. 46
12.4.2.2 - HOLE POSITION ON MODELS WITH RIGHT HINGED DOOR
Fig. 47
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12.4.2.3 - RELEASING THE “METEOR” DOOR LOCK
To release the door lock manually on Access Plus ovens with “METEOR” door lock, it is necessary to
remove the hook screw through a hole on the front panel (see 11.4.1):
1 - Insert a 3mm screwdriver into the hole to remove the hook fixing screw.
2 - Remove the hook fixing screw, in this way the closure hook lifts up releasing the door (see Fig. 48).
3 - Check the operation of the door lock and if faulty replace it (see 11.5).
Fig. 48
1 - 3 mm CROSS SCREWDRIVER
2 - HOLE TO ACCESS THE SCREW
12.4.2.4 - RELEASING THE “ELTEK” DOOR LOCK
To release the door lock manually on Access Plus ovens with “ELTEK” door lock, it is necessary to
remove directly the hook through the hole on the front panel (see 11.4.1):
1 - Insert a 3mm screwdriver into the hole to lift up the closure hook of about 3 mm to allow releasing the
door lock (see Fig. 49).
2 - Check the operation of the door lock and if faulty replace it (see 12.5).
Fig. 49
1 - 3 mm SCREWDRIVER
2 - HOLE TO ACCESS THE DOOR LOCK HOOK
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12.5 - TESTING THE DOOR LOCK
-
Measure the resistance of the winding of
the door lock actioning motor, which
should be about 9.5 Ω.
-
Check that the two microswitches open
and close correctly in the various
sequences (door open, door closed etc.)
as indicated in Service Manual
599 36 07 64, section 3.5.
Fig. 50
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13 - ACCESS/KRONOS: ORGANIZATION OF SERVICE MANUALS
In view of the quantity of theoretical, technical and practical information relative to the various
combinations for the structure of the ACCESS/KRONOS system, this information has been subdivided
into Service Manuals describing the general concepts, and separate Service Manuals containing specific
information relative to each group of appliances.
Only the specific Service Manuals should be used for a specific appliance.
The various Service Manuals are as shown in the diagram below.
GENERAL
PYROLYTIC
MANUAL
KRONOS
THEORETICAL
MANUAL
SPECIFIC
MANUAL
GENERAL MANUAL
STEAM
KRONOS: GENERAL
THEORY AND
TROUBLESHOOTING
ACCESS: MANUAL OF
CHARACTERISTICS
AND ACCESSIBILITY
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14 - REVISIONS
REVISION
DATE
01
03/2008
SOI 03.08 FV
- Added Chapter 9 - VARIANTS FOR MODELS WITH LIGHT BAR on
page 25.
- Added diagram on page 41.
- Added “Eltek” door lock in 12.4 page 47.
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