I had a similar problem and just solved it. My cooler was leaking and had trouble keeping the proper temperature. It was also making a buzzing sound which is what lead me to my solution. BTW - The liquid that was leaking was condensation, probably because the unit was not holding a constant temperature.
Unplug the unit first - no need to get electrocuted. These units use peltier cooling- essentially a large heat sink with three fans attached. Click here for more info regarding peltier cooling. The peltier unit is not repairable, but the fans are; which was what my problem was. There are three fans on this unit, one on the inside and two on the outside. Follow these steps to remove them.
Remove the rear cover. It is held on with ten screws. This exposes the two exterior fans and the peltier heat sink
The heat sink is held on with four screws - remove them and pull the heat sink out. The third fan is on a short wire lead, so be careful when removing the heat sink from the body of the cooler.
The two exterior fans are connected to a control panel, the electrical connection is easy to disconnect.
Once all of the wires have been disconnected, you can remove the fans from the heat sink.
The fans are screwed to a mounting plate, which is screwed to the heat sink
You must remove the mounting plate first to expose the screws that hold the fan to the mounting plate. The fans are typical computer case cooling fans
I only needed one fan, but replaced all three because I didn't want to do this job again.
I purchased my fans from Newark.com the prices were better than what I found at the computer websites. Also, these fans are much better than the original and will hopefully last much longer than the three I got from the old ones.
You need one of these and two of these. The total with shipping was around $30
You will need to splice the old electrical connection sockets onto the new fans using wire crimpers or solder them on.
Attach the components in reverse order and power on the unit.
These fnas may move more air than the originals, because the unit seemed to cool much quicker than I remember.
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It may be a good idea to call Emerson. The cooler you have has a temperature control board. At this moment I do not know for sure where you can get a replacement circuit board. Here below is a link to Emerson'son-linetechnicians. Give that a try and let me know how things go, Thanks, Sea Breeze (click below)