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6. Cleaning / Maintenance
Only perform cleaning and maintenance if
the oven is cold!
Use a soft, moist cloth and cleanser to clean the
housing.
Never use abrasive cleansers or cleansers containing
solvents!
6.1 Heating Muffle Inspection
Inspect the heating muffle regularly (at least once per
month) for damage and cracks.
The oven must be immediately taken out of
service if cracks result in a risk of the heat-
ing elements being able to be touched.
The heating muffle may only be replaced by an au-
thorised specialist. The following hazard information
must be observed during replacement:
Dust particles from the insulation jacket
trapped between the heating muffle and the
housing represent a health hazard if in-
haled!
Always wear respiratory protection during
disassembly / assembly work!
Always wear gloves protection during dis-
assembly / assembly work!
6.2 Cleaning the Oven Chamber
The oven chamber should be cleaned regularly to
remove dust and broken muffle and die pieces.
Switch the oven off at the main power
switch before cleaning.
Only clean the oven chamber once it is
cold.
Use only a dry cloth or vacuum cleaner to
clean the oven chamber. Never use cleans-
er or other liquids.
The investment materials used for the dies
represent a health hazard.
Comply with the investment material man-
ufacturers' safety data sheets and always
wear appropriate protective equipment.
6.3 Replacing the Fuses
The circuit breakers are located on the rear of the
unit (Figure 6) and can be reset if required (press the
button).
6.4 Replacing the Thermocouple
The thermocouple must be replaced if the protective
ceramic tube surrounding it is damaged.
Proceed as follows:
1. Switch the oven off at the main power switch.
2. Unplug the power cord at the wall outlet.
3. Turn the oven so that the thermocouple on the
back is easily accessible (Figure 7).
4. Loosen the fastening screw (Figure 8) and remove
the protective cover.
5. Disconnect the cable (Figure 9).
6. Pull the thermocouple straight out, towards the
rear (Figure 10).
7. Insert a new thermocouple into the oven, making
sure it is straight (Figure 10).
8. Connect the cable, making sure the colours match
(Figure 9):
- White:
Negative
- Orange:
Positive
9. Install the protective cover and secure it together
with the thermocouple using the fastening screw
(Figure 8).
6.5 Replacing the Door Sensor
The door sensor is a safety component. It
may not be manipulated.
After replacing the sensor it must be exam-
ined for proper function.
A sensor located on the underside of the door is used
to detect the door position. Should the oven overheat,
the sensor can become inactive so that the door's
closed state will no longer be detected.
To replace:
1. Switch the oven off and unplug the power cord at
the wall outlet.
2. Allow the oven to cool off.
3. Completely open the door and loosen the door's
fastening screws (Figure 18).
Injury hazard!
The springs are under tension. Hold them
when loosening.
4. Unhook the springs from their holder in the door
(Figure 19).
5. Gently press the metal housing outwards until the
door is released from its retainer (Figure 20).
6. Remove the door (Figure 21), leaving the springs
on the door pivots to avoid mixing them up.
7. The sensor (Figure 22-A) can be replaced using
pliers (Figure 22).
8. Reinsert the door in the housing and screw the
fastening screws down.
9. Remove the springs from the door pivots and first
insert them into the opening in the oven wall, then
rotate them and pull them back onto the pivots
(Figure 23).
10. Hook the springs to the door retainer (Figure 24).
11. Plug the power cord into the wall outlet and switch
the oven on.
12. Check that the switch is functioning properly:
- Select the speed programme;
- Enter a holding temperature of 30 °C;
- Start the heater.
- Open / close the oven door: With the door
closed the heater status indicator should be
red or green and must go out when the door is
opened.
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