I have a Dimplex MicroFire and it had a noisy flame effect.
I fixed it by buying a replacement synchronous motor from Amazon supplied by SourchingMap
8-10 RPM 220-240V 4W, CCW/CW
To fit you have to undo all the screws on the back of the fire and lift out the innards. The motor shaft is slightly fatter and the fixing locations will need to redefined. To do this make a cardboard template and drill 2 off 2mm holes for the fixing screws. Shorten the wires from the motor and fit them into the terminal block. When reassembled the motor can run clockwise or anti-clock wise, so just switch off the supply till it runs the right way.
But wonderful it is silent - PROBLEM SOLVED.
Ian Watkins
January 2014