Re: diplomat apm6855 frost free
hi mate
recently went to the same model with the same fault fitted a pcb with no success tracked down an ex diplomat techie who was pretty good on refrigeration he told me it was the fridge thermistor which is foamed into the wall and appliance b.e.r
i tried the usual before fitting pcb like reed switch,fan etc so i am pretty sure he was right he said he had come across the fault several times on this model
hope this helps
jonnie