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8. Clean the lambda sensor with a cloth.
9. Carefully retighten the lambda sensor locking nut to the flue pipe
with a pipe wrench.
10.Turn the mains electricity switch on.
11.Set the desired operating mode.
ā The cleaning of the lambda sensor is completed.
CLEANING THE FLUE SENSOR
1. Turn the mains electricity switch off.
2. Remove the top right cover at the front.
5. Carefully check whether the
lambda sensor (1) is still hot.
6. Using a pipe wrench, unscrew
the locking nut of the lambda
sensor (1).
7. Pull the lambda sensor (1) out
of the flue pipe (2).
Figure 7/15 - Cleaning the lambda sensor
Caution!
Danger of burns from hot surfaces!
During operation, the boiler surfaces under the cladding are hot.
Even when turned off, they only cool down slowly.
Switch the heating system off and only start with the cleaning and
maintenance work when the surfaces have cooled down.
3. Release the two screws (2)
with a Phillips screwdriver.
4. Remove the top right
cover (1) at the rear.
Figure 7/16 - Removing the cover at the rear
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