What brand/model/ refrigerator is it?
If a Norcold 1200 you can unplug it and then plug it in again. If that doesn't help you will need to pull the cover off the control panel and ground a pin.
I just had to do that last month to clear the same problem.
2004 Monaco La Palma 36DBD
Workhorse W22 8.1 Gas Allison 1000, 7.1 mpg
2000 LEXUS RX300 FWD 22MPG 4020 LBS
US Gear Brakes