My Hotpoint mistral fridge freezer is 6 years old and has just got a problem with the fridge not getting cold. I have thawed out the back of the freezer compartment and ensured the tube from the freeezer to the fridge is clear. When I close the fridge door I do hear a fan start to run. Once put back together the fridge worked for about 4 days then spent a day going between +4 and +17. then it went to +20 ish and just stays there. I have changed the yellow thermister (evaporator) but the problem is still there.
Any help would be much appreciated.
Thanks