My understanding from my previous experience is that you get ONE chance to correct the situation. It could be low voltage, unlevel, (sorry don't remember what else). Turn off the frig, correct all situations which might cause the NoCo. Level, check all batteries for charge of 12.5v or better. Then turn frig back on. If it works all is well, if it does not work and the NoCo persists I needed a mobile tech to reboot the board. This was accomplished with a paper clip shorting out the board. Something I would never attempt myself. Like I noted, I am not an expert, but I'm responding to give you some insight.