Bosch PRS926B90E Mode D'emploi page 9

Warnings
8
For dual double flame burners, the inner and outer
flames can be controlled separately.
The available power levels are as follows:
Inner and outer flame on full power.
Outer flame on minimum, inner flame on full power.
Inner flame on full power.
Inner flame on minimum.
It is normal to hear a whistling noise while the burner
is operating.
When it is first used, it is normal for the burner to give
off fumes; this does not pose any risk and does not
indicate a malfunction; they will disappear in time.
A few seconds after the burner is switched off, a
sound (thud) will be produced. This is not a fault- this
means that the safety device is no longer operating.
Keep the burner as clean as possible. If the ignition
sparkers are dirty, they will not light properly. Clean
them periodically using a small non-wire brush. Bear
in mind that the ignition sparkers must not suffer any
serious impacts.
An orange-coloured flame is normal. This is caused
by the presence of dust in the atmosphere, spilt
liquids, etc.