Weber SUMMIT S-470 Guide De L'utilisateur page 27

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WEBER SPIDER/INSECT SCREENS
Your Weber ® gas barbecue, as well as any outdoor gas appliance, is a target for spiders
and other insects. They can nest in the venturi section (1) of the burner tubes. This
blocks the normal gas flow, and can cause the gas to flow back out of the combustion
air opening. This could result in a fire in and around the combustion air openings, under
the control panel, causing serious damage to your barbecue.
The burner tube combustion air opening is fitted with a stainless steel screen (2) to
prevent spiders and other insects access to the burner tubes through the combustion air
openings.
We recommend that you inspect the Spider/Insect screens at least once a year.
(See Section "Annual Maintenance".) Also inspect and clean the the Spider/Insect
screens if any of the following symptoms should ever occur:
1) The smell of gas in conjunction with the burner flames appearing yellow and lazy.
2) Barbecue does not reach temperature.
3) Barbecue heats unevenly.
4) One or more of the burners do not ignite.
Failure to correct the above mentioned symptoms may result
in a fire, which can cause serious bodily injury or death, and
cause damage to property.
MAIN BURNER CLEANING PROCEDURE
TURN OFF THE GAS SUPPLY.
Remove the manifold (See "Replacing Main Burners").
Look inside each burner with a flashlight.
Clean the inside of the burners with a wire (a straightened-out coat hanger will work).
Check and clean the air shutter opening at the ends of the burners. Check and clean
the valve orifices at the base of the valves. Use a Steel bristle brush to clean outside of
burners. This is to make sure all the burner ports are fully open.
CAUTION: Do not enlarge the burner ports when cleaning.
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