Horn not making a horn noise

Are your air pipes clear of water? Mine can get some water that stops the horn working properly. You might also try a bike pump to blow out the cr@p in the horn?

There is nothing in the pipe between compressor and horn, also I cleaned out the horn using a cable tie (amazing amount of leaves etc in there which I thought would fix my problem) but no improvement.

I wonder if water has got into the air compressor but there is a good force of air coming through it so I would still expect the horn to work.
 
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