Peltier Unit Not Working
A peltier element is, in this order: 

1.) a heater

2.) a thermal shortcut

3.) a thermal transfer unit

What happens is this: 
When you turn it on, the whole unit starts to heat up. 
But one side is somewhat cooler than the other. 
At first, one side feels warm, one side feels cold. 
Then the whole unit becomes hot because it is a heater primarily. 
The small difference of maybe 10 degrees between sides is not noticeable when one is 60C and the other is 70C.
Source:  [1]: http://quick-cool.de/peltierelemente/fragen-zu-peltierelementen.htm "FAQ Peltier German"