Andrew posted this as an answer to somebody else's question
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
Nothing to do with me - just Andrew, January 2015