You may have a Freon leak at the compressor. Running this unit at low pressure will only make it leak that much more. Have a technician check it and refill is there is a fill port available.
SOURCE: Magic Chef MCWC44DZ E4 error
I found the connectors corroded for both fans. The lower fan connector had one pin that was completely destroyed. I hard wired the wires together as a test and the unit is working perfect. Check the fan connectors by removing the two screws that hold the shelf in place and cafefully slide out fron the cooler. You will have to disconnect several connectors hidden in the right side of the shelf before you can completely remove it. Good Luck.
SOURCE: E3 error message on Magic Chef wine cooler
Taken from another poster at Home Depot reviews and similiar to what others have found...
The e3/e4 problem is the "connectors" for the fans to the middle separator shelf are put in the pathway of condensation. This causes them to get wet and rust. PLEASE NOTE: If you decide to attempt this fix, you take full responsibility for your fridge and the outcome. If you don’t think you can do this…DON’T! Call a licensed electrician.
Here is how I resolved my e3 issue:
1) Unplug the fridge
2) Remove all wine and the metal shelves
3) Remove the 2 screws from the middle separator shelf, one on each side on top
4) Remove the 4 screws from the backboard, one in each corner
5) Slide out the middle shelf slowly, on the right hand side towards the front of the shelf there will be 4 connectors you must disconnect before removing the shelf (they are tucked into the shelf). With one hand on the backboard and one on the shelf, slowly take them out together
6) Once you have the backboard and shelf out, you'll see there is a black and white connector, each having a red and black wire on each side
7) These are the fan connectors that are causing the issue. Mine were brown/green and damp (not good for electricity)
8) Using wire cutters, cut as close as possible to the "black" connector on each side to remove it. You will have 4 wires left, 2 from the backboard and two from the shelf (both having a red and black)
9) Take some of the sheath (cover) off of each wire
10) Take the red wire from the backboard and the red wire from the shelf and twist the metal portion together
11) Cover w/ electrical tape!!! Or you will have the same e3/e4 issue
12) Repeat step 10 and 11 for the black wires
13) Move onto the "white" connector and repeat steps 8 - 12
14) Put the backboard and shelf back in the fridge. Be careful not to pull the backboard and shelf apart or your connection may come apart
15) As you slide the shelf in, make sure the wires you disconnected in step 5 are in the "channel" on the side of the shelf or the shelf won't slide properly.
16) Reattached the 4 connectors and then re-attach the backboard and the shelf with the screws
17) Plug the fridge back in
18) Put the metal shelves and wine back in"
Sucks that a $0.10 piece of heatshrink on the connectors could avoid this...? Bad Design.
SOURCE: Magic Chef Wine Cooler Model MCWC44DZ Where can I
On the Magic Chef site you can order parts for the cooler. I took mine out and treid to find them on the web somewhere else and could not locate them anywhere except China and England. I know this isn't true but tried every search option I could think of. They are about $22 plus shipping (HIGH). You might try the following: http://www.fixya.com/support/t1814377-magic_chef_mcwc44dz_e4_error
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