Hi turn off fridge and unplug, take off panel (grill) at front bottom, two philips screws ( you will have to open the freezer door to locate screws), see if there is a build up of fluff dust and clean off the elements to the right, I had the same problem and this solved it, it helps to use a duster and hoover to get all the dust off.
It might not be the problem but worth a try.
(UNPLUG FRIDGE FIRST !!!!)
Terry Seyforth, July 2005
