Manual with faultfinding help towards the end: http://www.tvha.co.uk/wp-content/uploads/2013/10/Glow-worm-Micron-50FF.pdf
More stuff (but questionable relevance) here: http://www.lovekin.net/glow-worm-micron-ff-faults.html
Google may be your friend. Use it intelligently.
andrew
January 2015