Dark Areas Around Central Heating Boiler

[Mobius1]

Hi,

I've noticed darkened paint around corners around my central heating boiler which is in the kitchen. This is fairly recent as it didn't look like this a couple months ago, when it was repaired and then later inspected.

I have a battery powered carbon monoxide detector within 2 metres which works and it hasn't gone off. Is this something to be concerned about? I have included a link to a photo of this.

http://img.photobucket.com/albums/v325/Syphadeus/Mobile%20Uploads/IMG_20150626_195237_zpsx8r6pufo.jpg

[alavahalf]

Nice to see someone asking a question and adding a good photo with it !

From what the picture shows .. whoever did the boxing in did a nice neat job. The flue can be inspected at a later date when the boiler has it's service. The one thing they didn't do was seal the edged with caulk. This would have stopped the ..Dust .. from escaping. That's all it is dust.
The reason they didn't seal the edges is because, when that front panel gets removed, a caulked edge would leave a bit of decorative damage on the ceiling that would need to be redone (the paint will peel). Personally I would have finished it off and redo it when need be.
Nothing to worry about .. It's not carbon monoxide. Just to ease your mind press the test button on your alarm. By the way all the C/M alarms I have fitted (100s) have usually said 'Don't fit close to the boiler'.

[Mobius1]

Thank you alavahalf - your helpful response has put my mind at ease!

The C/M detector I have is free-standing and is located on top of a kitchen cupboard directly opposite (across the kitchen) from the boiler. In the manual it suggests that this is an okay place to have it (it also says not to put it directly next to a unit).

Thanks again.