When you replace the Norcold 1200 series COOLING UNIT, you ALWAYS replace the 2 fans and the Fan Tstat. What you describe is intermittant cooling fan operation. When I replace 1200 series Refer cooling units, besides the fans and fan tstat, I run 2 wires from the fan tstat down the back side to bypass the fan tstat to run the fans 24/7 to aid in diagnosis. What you can do is install a small 120 volt fan blowing up from the rear bottom outside access door and retest the refer. If it operates correctly you will need to pull the refer and replace the fans and fan tstat. Doug
