Quick combi boiler question. Help please!

[DarrenSV650S]

Our boiler has gone off again. It happened a month or so ago and the guy came out and cleaned out the air sensor. And that was that, it was fixed.

I think I've found the air sensor, shown below (is that it?), but how and what do I clean?

http://i88.photobucket.com/albums/k164/DarrenStewartTait/DSCF0020-4.jpg

[Holdup]

Thought you was an electrician not a gas safe registered plumber / gas man

[BigBaddad]

If you don't know what you're doing, leave it alone. Perhaps get your boiler serviced and ask the engineer. Service is about £50