I found MFF2558VEM1 MFF2558VEM2 MFF2558VEM3 MFF2558VEM4 MFF2558VEM5 MFF2558VEM6 MFF2558VEM9 MFF2558VEM10MFF2558VEM
It is the MFF2558VEM3, thanks for pointing that out. Unfortunately, it doesn't look like it will let me amend the original post at this point.
Yes, frost build up on the evaporator, when this happens, the fridge becomes warm. Doing a forced defrost a couple times seems to work to remove the ice build up and as a result the fridge becomes cold again. Back in February, I discovered the ice build up for the first time and there was a pretty substantial amount of it, so I used a heat gun to remove it all quickly. The fridge continued to stay cold for about 4-5 months until a couple days after I came back from vacation in July and discovered the temperature was above 40F and climbing. I didn't unplug the fridge/freezer unit when I was on vacation and there were no power outages in the area during that time.Are you getting frost build on the evaporator?
Thanks Rick, I'll replace the board, program it and post again if there's any further issue.Sorry for the bad news. Only three parts in almost all defrost systems, heater, thermostat, and main control board or defrost timer. If the heater turned on in forced defrost, the heater and thermostat are working correctly. That just leaves the control as the failed part. I have no idea what fails on the boards. As long as the heater and thermostat are good, no further testing necessary. Replace the board and you're good to go. New boards need to be programed first.
Thanks for fixing that, Jeff.All fixed up for the model#.