Yes you turn it off then on again and it will restart HOWEVER, if it happens a second time your unit will go into lockup mode and won't do anything. I had issues with mine (long story) and this happened when I was the slightest bit out of level. It would give me the no co if I was in elec or in gas mode. it's supposed to be a safety mode so it has to be checked by a dealer. If it goes into lockup mode there is a way to reset it, you have to pull all the wires off the refrig board and reinstall them along with shorting out a pin on the wiring harness until it clicks and resets...you then can turn the frig on again. You can google norcold no co error message and get the right procedure and pin to short out. Mine was happening so often this summer, I had a wire and tools all set to reset it...takes about 10-15 mins. I had originally swapped out the cooling unit before the summer but I think the unit was defective, thus all the error codes.got on the phone with the factory and they shipped out a replacement unit, I swapped out the cooling unit again and hopefully this corrected the problem. Had to throw away alot of food because of no co error messages. If the replacement unit works...great if not I too will be going to a residential style all electric unit.