I have a Wine Enthusiast 272 48 02 51W Dual Zone Wine Cooler. This cooler has two FX100-1B control boards. When one side failed I bought a replacement FX100-1B control board. The replacement board does not turn the fan and cooling outputs off when the desired temperature is reached and the green led on the board turns off, the outputs are always energized. On the working original board when the green led turns off so does everything else. Is there something special about the boards Wine enthusiast used? I have also swapped the boards from one circuit to the other to rule out any problem with other components. I would appreciate any insight from this group.

 

It's just a guess but the pinouts of the cable connectors on the boards may be a bit different. Can you get good photos of those?

 

The boards seem the same. It looks as though this board can be programed for different modes of operation. How does one enter the setup parameters. My unit does not have a "Set" button, just "up" and "down". It appears as though the setup on the board might not match the desired operation.

 

Have a look at this very long thread. There might be some information related to the dual zone wine cooler.

https://forum.allaboutcircuits.com/...moelectric-cooler.101748/page-22#post-1776360

In many cases, a faulty control board was fixed by replacing C8, 47 μF / 25 V electrolytic capacitor.