Electrolux TC2 User manual

SERVICE MANUAL
DRYERS
©ELECTROLUX ZANUSSI S.p.A.
Spares Operations Italy
Corso Lino Zanussi, 30
Publication No.
I - 33080 PORCIA /PN (ITALY) 599 38 46-21
Fax: + 39 0434 394096
Edition: 2006-10 25
EN
Condenser dryer with
electronic control system
ENV 06
Stylings
TC2 – TC3 – TC4 – TC6
Production:
PLY – Siewierz (PL)

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INDICE
1Purpose of this Manual............................................................................................................................... 4
2IMPORTANT .............................................................................................................................................. 4
2.1 Installation............................................................................................................................................. 4
3GENERAL CHARACTERISTICS............................................................................................................... 5
3.1 Technical data ...................................................................................................................................... 5
3.2 Electronic boards.................................................................................................................................. 5
4CONTROL PANEL..................................................................................................................................... 6
4.1 Stylings................................................................................................................................................. 6
4.2 Programme selector ............................................................................................................................. 6
4.3 Buttons.................................................................................................................................................. 7
4.3.1 Buttons on stylings with and without LCD.................................................................................... 7
4.4 Symbols on stylings with LCD.............................................................................................................. 8
4.5 Humidity level (on some models) ......................................................................................................... 9
4.6 Child protection (on some models) ................................................................................................ 9
4.7 Delicate ½ power (on some models) ............................................................................................. 9
4.8 No buzzer button ......................................................................................................................... 10
4.9 Delayed start button .................................................................................................................... 11
4.10 “START / PAUSE” button............................................................................................................... 11
4.11 Adjusting the level of conductivity (on some models).................................................................... 12
4.11.1 Procedure................................................................................................................................... 12
4.12 Warning LEDs................................................................................................................................ 13
5Description of operation of the appliance................................................................................................. 14
5.1 Operation of a cycle............................................................................................................................ 14
5.2 Operation in PAUSE mode................................................................................................................. 14
5.3 Operation in DELAYED START mode ............................................................................................... 15
5.4 Power failure....................................................................................................................................... 15
6STRUCTURAL AND FUNCTIONAL CHARACTERISTICS ..................................................................... 16
6.1 Drying circuit....................................................................................................................................... 16
6.2 Structural characteristics .................................................................................................................... 17
6.3 Drum................................................................................................................................................... 18
6.4 Air seals and drum shaft supports...................................................................................................... 18
6.5 Hydraulic circuit (versions with canister in upper section).................................................................. 19
6.6 Drum rotation...................................................................................................................................... 19
7ELECTRICAL COMPONENTS ................................................................................................................ 20
7.1 EDR2000 Electronic control ............................................................................................................... 20
7.1.1 Electronic board functions.......................................................................................................... 20
7.1.2 General structure of board memory........................................................................................... 21
7.2 Conductimetric sensor........................................................................................................................ 22
7.3 Terminal block with incorporated suppressor.....................................................................................22
7.4 Heater unit.......................................................................................................................................... 23
7.5 NTC sensor......................................................................................................................................... 23
7.6 Motor................................................................................................................................................... 24
7.7 Canister filling pipe (models with canister in upper section) .............................................................. 24
7.8 Door interlock...................................................................................................................................... 25
8ELECTRICAL CIRCUIT............................................................................................................................ 26
9DIAGNOSTICS SYSTEM......................................................................................................................... 27
9.1 Access to diagnostics......................................................................................................................... 27
9.2 Exiting the diagnostics system ........................................................................................................... 28
9.3 Selector positions for diagnostics on appliances with styling TC2 – TC3 – TC4 ............................... 29
9.4 Selector positions for diagnostics on appliances with styling TC6.................................................... 31
10 ALARMS............................................................................................................................................. 32
10.1 Displaying the alarms to the user................................................................................................... 32
10.1.1 Alarm display during normal operation...................................................................................... 32
10.2 Reading the alarm codes ............................................................................................................... 32
10.2.1 Displaying the alarm code on models TC2 – TC3..................................................................... 32
10.2.2 Displaying the alarm code on models TC4 – TC6..................................................................... 32
10.3 Cancelling the last alarm memorized.............................................................................................33
10.4 Notes concerning certain alarm codes........................................................................................... 33
10.5 Table of alarms............................................................................................................................... 34
11 NO ACCESS TO DIAGNOSTICS PROGRAMME ............................................................................. 37
11.1 No LEDs on the display board light................................................................................................ 37

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11.2 Some of the LEDs on the display board light................................................................................. 38
12 ACCESSIBILITY TO COMPONENTS................................................................................................ 39
12.1 Door................................................................................................................................................ 39
12.1.1 Door ........................................................................................................................................... 39
12.1.2 Fluff filter fitted inside door......................................................................................................... 39
12.1.3 Fluff filter support....................................................................................................................... 39
12.1.4 Lower fluff filter........................................................................................................................... 39
12.1.5 Drum light (if featured)............................................................................................................... 39
12.2 Work top......................................................................................................................................... 40
12.2.1 Front brush of conductimetric sensor ........................................................................................ 40
12.2.2 Canister...................................................................................................................................... 40
12.2.3 Control panel support and Control panel................................................................................... 41
12.2.4 Main electronic board................................................................................................................. 42
12.2.5 Selector pin................................................................................................................................ 42
12.2.6 Selector knob............................................................................................................................. 42
12.2.7 Button springing......................................................................................................................... 42
12.2.8 Button and visor unit on models TC2......................................................................................... 42
12.3 Removal of both cover and rear panel gives access to:................................................................ 43
12.3.1 Heater unit.................................................................................................................................. 43
12.3.2 Removal of the left-hand side panel gives access to: ............................................................... 44
12.3.3 Floating switch........................................................................................................................... 44
12.3.4 Float........................................................................................................................................... 45
12.3.5 Pump.......................................................................................................................................... 45
12.3.6 Door interlock............................................................................................................................. 46
12.4 Removal of the right-hand side panel gives access to:.................................................................. 47
12.4.1 Condensatore motore................................................................................................................ 47
12.4.2 NTC Sensor ............................................................................................................................... 48
12.4.3 Rear air duct cover (hot air circulation)...................................................................................... 48
12.4.4 Rear air duct cover (cold air circulation).................................................................................... 48
12.4.5 Drum rotation motor................................................................................................................... 49
12.5 Removal of the front panel gives access to: .................................................................................. 50
12.5.1 Capacitor (Heat exchanger)....................................................................................................... 50
12.5.2 Front flap.................................................................................................................................... 50
12.5.3 Plinth.......................................................................................................................................... 51
12.5.4 Door microswitch ....................................................................................................................... 51
12.6 Removal of the rear panel gives access to:................................................................................... 52
12.6.1 Rear brush (conductimetric sensor)........................................................................................... 52
12.6.2 Rear panel.................................................................................................................................. 52
12.6.3 Drive belt.................................................................................................................................... 52
12.6.4 Drum .......................................................................................................................................... 52
12.6.5 Duct............................................................................................................................................ 53
12.6.6 Duct rollers................................................................................................................................. 53
12.6.7 Front and rear seals................................................................................................................... 53
13 REVERSIBILITY OF THE DOOR.......................................................................................................54
14 FINAL TESTING OF DOOR CLOSURE............................................................................................. 56

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1 Purpose of this Manual
The purpose of this Service Manual is to provide service engineers who already have the basic knowledge
necessary to repair dryers with information concerning condenser dryers with electronic control systems ENV 06
with anti-crease system CRM produced in the factory of Siewierz (Poland).
The control system features two PCBs: a main one featuring an integrated selector and LCD display,
supplied already mounted and tested by the building factory and a control board of the CRM system.
This Service Manual describes the following aspects:
•General characteristics
•Control panel and drying programmes
•Technical characteristics
•Accessibility
•Diagnostics guide
2 IMPORTANT
WARNING
ÖRepairs to electrical appliances must be carried out only by qualified service engineers.
ÖBefore touching internal components, always remove the plug from the power socket.
2.1 Installation
ÖThe appliance must be installed on a perfectly level surface in order to ensure that the condensed water
flows correctly into the tank.
ÖThe feet must NOT be removed. The gap between the bottom of the dryer and the floor is essential to
prevent overheating.

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3 GENERAL CHARACTERISTICS
3.1 Technical data
Dimensions of appliance Height: Width:
Depth:
85 cm
60 cm
58 cm
Power supply Volt:
Hz: 220-240 50/60
No. pushbuttons 7⇒(TC2) 6⇒(TC3) 5⇒(TC5) 3⇒(TC6)
No. LEDs
TC2 ⇒3 + 1 bicolour on start button (red green)
TC3 ⇒9 + 1 bicolour on start button (red green)
TC4 ⇒14 + 1 bicolour on start button (red green)
TC6 ⇒8 + 1 bicolour on start button (red green)
Type of display LCD on TC2 – TC3 models
Buzzer Buzzer incorporated in the PCB
Serial port DAAS-EAP protocol up to 230400 baud
Programme selector TC2 – TC3 – TC4 ⇒15 positions
TC6 ⇒21 positions timer 25 temperometric With ON/OFF
switch integrated
Drying system Condensation of humidity by heat exchanger
Humidity control Conductimetric sensor
Motor Single-phase asynchronous motor with capacitor
Power of heater unit Version 220-240V 2200 W 1400 W + 800 W
Temperature control NTC sensor
Capacity of canister Condensation tank 4l approx.
Canister fill pump Synchronous motor
3.2 Electronic boards
The electronic control system consists of a main PCB having an integrated selector and also a LCD display
(in some models) supplied already mounted and tested by the building factory.
Main PCB
TC2
TC3
TC4 / TC6

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4 CONTROL PANEL
4.1 Stylings
With LCD
TC2
TC3
With LED
TC4
TC6
4.2 Programme selector
The 15-position programme selector onTC2 – TC3 – TC4 models and 21/25 positions on TC6 models (with
incorporated ON/OFF switch) is built into the board.
The symbols represent the different possibilities of
drying the various fabrics COTTON SYNTHETICS
SILK and WOOL.
All positions can be configured depending on the
model.

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4.3 Buttons
4.3.1 Buttons on stylings with and without LCD
TC2
TC3
TC4
TC6
1. Configurable button
2. Configurable button
3. Configurable button
4. Configurable button
5. Configurable button
6. START/PAUSE button
7. Delayed start button
8. LCD
9. Programme selector
6
5
4
3
21
7
8
9
6
4
3
2
1
7
8
9
6
4
3
2
7
9
6
3
2
9

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4.4 Symbols on stylings with LCD
The various icons and writings represented on the LCD display are displayed depending on the programme
and on the programme phase being executed.
Delayed start
Drying phase
Cooling phase
Anti-crease phase
Child protection (key lock)
Delicate
Buzzer
Time-to-end / Alarm code

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4.5 Humidity level (on some models)
By pushing this button it is possible to select one of the three different final drying levels of the programme
represented by the following symbols:
•MIN (the time varies depending on the programme)
•MED (the programme is prolonged by 3 minutes)
•MAX (the programme is prolonged by 6 minutes)
4.6 Child protection (on some models)
By pushing simultaneously for 5 seconds the buttons
4 and 5 on TC2 models
3 and 4 on TC3 models
the child protection is activated, all buttons are disabled
and no modification is allowed.
To deactivate this protection, push the same buttons
again.
4.7 Delicate ½ power (on some models)
The dryer features a heating unit which consists of two heating elements, and according to the versions the
powers are different.
Pressing once the button, the electronic control excludes the less powerful branch of the heating unit and
simultaneously the LED lights up to indicate that the option has been selected; pressing it again, the LED
switches off to indicate that the option has been deactivated and the previously excluded branch will be
powered again during the cycle execution.

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4.8 No buzzer button
Option to be selected when the dryer is in selection mode (set-up).
Press this button to exclude the buzzer: the exclusion is signalled by the switching on of the LED or of the
icon, depending on the models. To reactivate the option, press the button again.
Even if the buzzer is excluded, the alarm acoustic signalling remains active.
Exclusion of the buzzer (not only for the affected cycle)
Selection to be made during the selection phase (set-up):
On TC2 models push buttons 2and 3
simultaneously for five seconds: the icon
representing the buzzer will light up and a beep will
be emitted.
On TC3 models push buttons 2and 3
simultaneously for five seconds: the LED
representing the buzzer will light up and a beep will
be emitted.
On TC4 models push buttons 1and 2
simultaneously for five seconds: the LED
representing the buzzer will light up and a beep will
be emitted.
On TC6 models push buttons 1and 2
simultaneously for five seconds and a beep will be
emitted.
To reactivate the buzzer, push the key combination above described again till the buzzer emits a “Beep”.
Attention: on TC6 models no acoustic signal will be emitted.

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4.9 Delayed start button
Pressing this button it is possible to select, during the
programme selection phase, a delayed start.
On TC2 and TC3 models, the time varies up to 12 hours;
the time is displayed in the Display.
Every time the button is pressed, the time displayed
increases:
ÖFor the first two hours, the step is about half an hour
ÖLater, the step is one hour
ÖTo cancel the delay, move the selector by one
position or press the button till the display is reset.
On TC5 models the time varies till max. 9 hours.
Push the button till the relative pilot lamp of the chosen
delay lights up.
This option must be selected in all models after selecting the programme and before pushing
START/PAUSE.
4.10 “START / PAUSE” button
Start
When a drying programme is selected with the selector, the icons of the three phases (drying, cooling, anti-
crease) light up and the LED START/PAUSE flashes.
After having selected the options, press this button to start the cycle; the relative LED remains lit.
Pause
If a drying cycle is being executed, pressing the START/PAUSE button, the dryer interrupts the cycle and is
in PAUSE mode; the relative LED flashes.
Pressing the START/PAUSE button, the drying cycle starts from the point at which it was interrupted.

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4.11 Adjusting the level of conductivity (on some models)
The conductivity of the water used to wash the fabrics varies from zone to zone. The conductimetric sensor
is calibrated to a standard value: any major variations in the level of conductivity may affect the final drying
result (i.e. the washing may be too dry or too humid):
These variations are more noticeable in the "slightly damp" or "iron-ready" cycles; the "cupboard dry cycles
are almost entirely unaffected by variations in conductivity.
The sensitivity of the conductimetric sensor can be adjusted according to the conductivity of the water.
4.11.1 Procedure
•To access adjustment mode:
1. Turn the programme selector to switch on the
appliance.
2. In selection mode (set-up), simultaneously
press buttons 3 (Delicate) and 6
(start/pause).
On TC2 and TC3 models
Hold the buttons down till “C0” appears on the
first 2 digits and the buzzer sounds (about 5
seconds).
•Adjusting the level of conductivity:
Press the 6 button sequentially (start/pause):
the level of conductivity is indicated by the
lighting of the horizontal hyphens of the last
digit.
On TC5 models
Hold the buttons down till the pilot lamps placed
above the buttons start to flash and one of the
pilot lamps that indicate the drying phase remains
on:
•Adjusting the level of conductivity:
Push the START/PAUSE button sequentially: the
conductivity level will be indicated by the pilot
lamps of the single phases.
•Memorizing the new setting:
1. Simultaneously press buttons 3 (Delicate)
and 6 (start/pause).
2. Hold the buttons down until the drying cycle
reappears on the display and the buzzer
sounds (about 5 seconds).

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Display
Conductivity Approximate value (μS/cm)
Low < 300
Medium 300 - 600
High > 600
Normally, the appliance is factory-set to the highest level; however, certain models may be
configured differently.
Your local water supply company can give you information concerning the conductivity of the water in your
area.
4.12 Warning LEDs
L1. Heat exchanger cleaning (condenser): it lights up after
80 drying cycles.
To reset the cycle counter (for this function), open the
door with the appliance on, extract the heat exchanger,
clean it and recluse the door.
L2. Filter cleaning: it lights up when the dryer has
terminated the cycle to warn the user to clean the fluff
filter.
L3. Tank full: it lights up durino the drying cycle if the
electronic circuit detects the closing of the floating
microswitch and at the end of the cycle to warn the user
to empty the tank.
L4. Start/pause: it lights up with green flashing light when
the cycle is in pause; it lights up with green fixed light
when the cycle is running regularly. If there is an alarm
three beeps will be emitted that will be repeated after
some seconds and the LED becomes red with flashing
light.
L1
L2
L3
L4

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5 Description of operation of the appliance
When the selector is turned from OFF position to a drying programme, the icons relative to the drying phases
light up and the START/PAUSE LED flashes with green light.
During this phase the various options can be entered, and the corresponding LEDs will light.
The lower right display shows the maximum time of drying cycle.
If an option that is incompatible with the selected cycle is entered, the Buzzer sounds, the Display shows Err
while the LEDs flash.
Selecting one or more options the Display shows an increase or decrease of the time.
If the position of the selector is changed after choosing the options, but before pressing START/PAUSE
button, the options will be cancelled.
5.1 Operation of a cycle
A drying cycle starts after a programme has been selected using the selector, one option (if necessary) has
been selected and the START/PAUSE pushbutton has been pressed.
The LED corresponding to the START/PAUSE button remains lit with green light and, at the same time, the LED
corresponding to the phase currently being performed lights and the display shows the maximum drying time.
The drying cycle consists of the following phases:
•DRYING
If the cycle is automatic, its duration will be the time necessary to remove the humidity until the desired
degree of final humidity is reached (maximum cycle time 180 minutes at full power and 240 minutes at half
power).
If the cycle is timer-controlled, the duration will be the time selected by the user.
•COOLING
For timer-controlled cycles, the maximum duration of the cooling phase is 10 minutes; for automatic cycles
the duration depends on the temperature inside the drum.
•ANTI-CREASE
The duration of the anti-crease cycle is 30 minutes.
No modifications to the programmes can be entered after the drying programme has started.
If the position of the selector is changed, the green LED of the START / PAUSE button starts flashing, the
buzzer sounds to warn the user that an incorrect operation has been attempted and the display shows <<Err>>.
If any button is pressed, the green LED of the START / PAUSE button starts flashing, the buzzer sounds to warn
the user that an incorrect operation has been attempted and the display shows <<Err>>.
The options can be selected only after selecting a drying programme at the beginning of the cycle, or during a
cycle after pressing the START/PAUSE button.
To cancel a drying cycle, it is necessary to turn the programme selector to OFF.
5.2 Operation in PAUSE mode
If START/PAUSE is pressed while a drying cycle is being performed, the dryer interrupts the current cycle, the
green LED of the START / PAUSE button flashes and the display shows time to end.
If the selector is turned, the buzzer warns the user of the error.
In this situation, only certain options can be modified, see table of OPTIONS.
If the button relative to an option that cannot be selected is pressed, the buzzer sounds to warn the user of the
error and the display shows <<Err>>.
When START/PAUSE is pressed again, the drying cycle resumes from the point at which it was interrupted.

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5.3 Operation in DELAYED START mode
After selecting a drying cycle, press this button to enter the delayed start option (the selected time is
indicated on the display). Every time the button is pressed the delay time increases, (for the first 2 hours the
time increases of half an hour, then of an hour), the maximum time that can be selected is 20 hours.
To cancel this option move the selector of one position or press the button till the option is cancelled on the
display. The start of the cycle is always determined by pressing the START/PAUSE button.
5.4 Power failure
The table below shows how the dryer behaves in the event of a power failure during a drying cycle.
Before the power failure After power is restored
Set-up Set-up
Drying cycle Pause
Cycle paused Pause
Anti-crease phase End of cycle
Delayed-start cycle Delayed-start cycle paused
Delayed start cycle paused Delayed start cycle paused
End of cycle End of cycle
"Canister full" alarm "Canister full" alarm

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6 STRUCTURAL AND FUNCTIONAL CHARACTERISTICS
6.1 Drying circuit
Version with canister in upper section Version with canister in lower section
There are two air circuits inside the dryer:
the first is a warm-air circuit, which is sealed within the appliance
the second is an open cold-air circuit, which circulates air from the ambient through certain sections of
the appliance.
In the sealed warm-air circuit, the air circulates inside the appliance:
The fan (1), ducts the air through a heat exchanger (5), and then to the heater unit (2). The heater unit heats
the air, which is then ducted into the drum through the perforations in the rear flange of the drum. The warm,
dry air passes through the wash load, which is agitated by the rotation of the drum, and removes the
humidity from the fabrics; the air, which is now warm and humid, passes then through the front aperture of
the drum via the fluff filter (3) and the lower filter (4), then the air is ducted by the fan (1) to the heat
exchanger (5), where the humidity is condensed.
The air coming from the heat exchanger is now dry and the cycle continues as described above.
The cold-air circuit (the air circulates in one side of the appliance) is not sealed.
The fan (6) draws in air through an air intake on the rear of the appliance, and ducts the air to the heat
exchanger (5), cooling it, after which the air is expelled on the opposite side of the heat exchanger
dissipating inside the appliance and exiting from the venting grille in the plinth.
The warm and cold air circuits cross inside the heat exchanger (5), which results in a thermal exchange
which condenses the humidity contained in the warm air.
The condensation water, which forms in the heat exchanger, is collected in a sump (7) which contains a float
(9):
¾In versions with the canister in the upper section, a pump (11) ducts the water from the sump (7) to the
canister (8). When the canister is full, any overflow is collected in the canister support and returned
through a tube (not shown in the figure) into the sump (7). This causes the float (9) to rise, thus actioning
the microswitch (10).
¾In versions with the canister in the lower section, the water flows by gravity from the sump (7) into the
canister (8); when the canister is full, the water level in the sump (7) rises. This causes the float (9) to
rise, thus actioning the microswitch (10).
The electronic control system detects the closure of the microswitch, cuts off the power to the appliance and
switches on a LED warning the user that the canister is full.
The tank capacity is about 4 lt., which is sufficient for one drying cycle.

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6.2 Structural characteristics
Version with canister in upper section Version with canister in lower section
1 – Work top
2 – Control panel support
3 – Control panel
4 – Fluff filter
5 – Fluff filter support
6 – Door seal
7 – Door internal frame
8 – Door external frame
9 – Rear panel cover protection
10 – Rear panel cover
11 – Rear panel
12 – Cross-member
13 – Side panels
14 – Upper tank
15 – Tank support
16 – Duct
17 – Front panel
18 – Base
19 – Heat exchanger
20 – Panel
21 – Plinth
22 – Front fluff filter
1 – Work top
2 – Control panel support
3 – Control panel
4 – Fluff filter
5 – Fluff filter support
6 – Door seal
7 – Door internal frame
8 – Door external frame
9 – Rear panel cover protection
10 – Rear panel cover
11 – Rear panel
12 – Cross-member
13 – Side panel
14 – Duct
15 – Front panel
16 – Lower fluff filter
17 – Base
18 – Heat exchanger
19 – Lower canister
20 – Panel
21 – Plinth
The front panel and the side panels are in enamelled sheet metal; the rear panel is in zinc-plated sheet
metal. The panels are secured to the base by self-tapping screws.
The shaped carboran base houses the main components.

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6.3 Drum
1 – Front flange
2 – Drum housing
3 – Rear flange
4 – Drum lifters
5 - Plastic band
The drum consists of two half-shells (front and rear) which are joined together by a wide plastic band (5).
Separation of the drum into two parts allows the conductimetric sensor to determine the conductivity of the
washing inside the drum.
Parts 1, 2 and 3 are connected by crimping.
The plastic lifters are secured by screws to the internal wall of the drum.
The various elements which make up the drum are in sheet steel.
The rear drum shaft is fitted to the rear flange using eyelet rivets.
6.4 Air seals and drum shaft supports
Rear air seal
1 - Rear seal (fitted to rear panel)
2 - Drum
3 - Rear panel
Rear drum support
4 – Anti-clutching washer
5 – Fixing ring (Benzing)
6 – Rear panel
7 – Drum spindle
8 – Support with bushing (fitted to the rear panel)
Front drum support and air seal
9 – Drum
10 – Felt ring with tubular support
11 – Duct
Lower drum support
9 – Drum
10 – Felt ring with tubular support
11 – Duct
12 – Drum support roller

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6.5 Hydraulic circuit (versions with canister in upper section)
1 – Pump immersed in the sump
2 – Water fill hose to canister (Red)
3 – Overflow drain hose (Transparent)
4 – Canister
The condensation water is ducted from the sump (1) to the tank (4) by the pump immersed in the sump via
the hose (2). When the canister is full the overflow is collected in the canister support and ducted to the
sump through the hose (3).
6.6 Drum rotation
1 – Motor
2 – Belt tensioner spring
3 – Belt tensioner
4 – Belt
The drum is rotated by a belt (4), which is driven by the pulley of the drum motor (1) fitted to the base; on the
bearing shield there is a belt tensioner (3), which has the function of increasing the winding angle of the belt
to the drum and works in conjunction with the belt tensioner spring (2).
Bidirectional operation of the drum rotation is determined by the electronic board which inverts the motor
power direction for brief periods. Reversal of the direction of rotation allows the clothes to unroll. During
these short periods, the heater unit is switched off.
The heat exchanger features a safety device which ensures that, if the panel is opened to check the heat
exchanger, a microswitch disconnects the dryer from the power supply).