Waeco fridge - button not working

Hi guys just plugged my fridge back in waeco cf60 and went to turn the temp down from 5 to 2 degrees and the - minus button doesn't seem to be working so I pressed the + button up to 5 degrees n now I can't get it to come down, never had an issue ever with it, anyone had this happen? N how was it fixed! I live in a remote area and won't be able to have it looked at for at least 2 months when I drive to Kalgoorlie