we have the same problem the motor makes a loud clicking noise even if in "effect mode" there is so many screws to undo, we had a quote from a repairer-after a very long search, £175.00 to fix the problem ! was told that the gears inside the motor are now made of plastic, which break down over time & " mesh " together causing the clicking noise, the cost of a new motor is about £40 - £ 50 quid from dimplex, we are in the process of getting a new fire ( same one ) from john lewis.com as in the longer term think its the cheaper option.
tom newton, January 2010