A couple of days ago my fridge was making noise so I cleaned the condenser coils for the first time in 2 years.
They had some dust but were not totally obstructed.
After that the temperature in the fridge side started rising and the freezer dropping (compressor running continuously).
I checked all the normal stuff (like condenser cooling fan, evaporator fan, air door) and everything was fine.
Let the fridge run overnight since they always say to wait 24 after changing something.
Yesterday morning the fridge was in the mid 40's and freezer at -10 (F).
I did some internet research and discovered if the control board was defective it is a $800 NOS part or a 2-3 week rebuild.
So we went to lunch and bought a new fridge for the garage so we could move the food out and troubleshoot / repair the KitchenAid.
Came home and the overtemp alarm was sounding and the compressor not running.
Reset the alarm and power cycled the fridge.
After some time it started cooling again.
Purchased the service manual.
Looked at the evaporator thru the holes and it was iced up.
There was air coming out at the top of the freezer (over the ice maker) but none coming thru the air door (which was open).
I took a PC fan and set it up to pull air thru the air door to bring the fridge temp down so the food in the fridge did not spoil before the new fridge arrived
After a few hours the fridge temps was in the 30's.
I figured if the defroster was not working the drip pan would be empty.
I pulled the drip pan out and it was half full of water with rust color in the bottom of the pan.
Left everything the same overnight last night and this afternoon the drip pan was ABSOLUTELY full !!!
Now the air is flowing into the fridge by itself so I removed the PC fan.
Apparently the evaporator iced up but then over two days the defroster melted the ice.
Was this due to the condenser coils not being cleaned for two years?
Is the control board ($800 new part or 2 week $200 rebuild) or bi metal sensor intermittent?
I plan on running the self test diagnostics after we move the food into the new fridge tomorrow.
The defrost cycle is supposed to be automatic and vary in frequency depending on how often it is needed.
Obviously this did not work. It would be nice if they had an evaporator iced up indicator and manual defrost control.
Apparently the defrost did finally come on and melt two drip pan trays full of ice.
Has anyone seen this before and have any suggestions?