Owner’s Manual 8- If 120 volts AC is available to the refrigerator:- The light bar beside AC [4] also shows in the centerdisplay.- After ten seconds, the light bar beside AC goes off andonly the light bar beside AUTO remains.- This means that the refrigerator is operating on ACelectric.- If 120 volts AC is not available to the refrigerator:- The light bar beside AC [4] also shows in the centerdisplay.- After a few seconds, the light bar beside AC goes offand the light bar beside LP GAS [6] shows.- After 10 seconds, the light bar beside LP GAS goes offand only the light bar beside AUTO remains.- This means that the refrigerator is operating onpropane gas.- On model N510 only, if neither 120 volts AC nor propanegas is available to the refrigerator:- The fault code “F” shows in the center display.- On model N510.3 only, if neither 120 volts AC nor propanegas is available to the refrigerator:- The refrigerator control will automatically change to DCelectric operation.NOTE: DC electric operation is less efficient than ACelectric and propane gas. Use DC electricoperation only to maintain the refrigeratortemperature while in transit and if the otherenergy sources are not available. Do not useDC electric to initially decrease the temperatureof the refrigerator.If an energy source is available to the refrigerator, but is notoperating correctly:- A fault code shows in the center display.- The refrigerator controls try to change to a less efficientenergy source.- If a less efficient energy source is not available:- A fault code shows in the center display.- Refer to the “Fault Codes” section of this manual.Set the controls to manual mode operation:- Push the ON / OFF button to turn the refrigerator on.- Push and hold the MODE button until the light bar showsbeside AC [4] and then release.- This means that the refrigerator is operating on ACelectric.- Push and hold the MODE button until the light bar showsbeside LP GAS [6] and then release.- This means that the refrigerator is operating onpropane gas.- Push and hold the MODE button until the light bar showsbeside DC [8] and then release.- This means that the refrigerator is operating on ACelectric.If the energy source is interrupted:- A fault code shows in the center display.- Refer to the “Fault Codes” section of this manual.Cooling unit sensing:The controls have the ability to sense the operation of thecooling unit. If the controls sense that the cooling unit hasstopped cooling:- The heat sources to the cooling unit are turned off and arelocked out by the controls.- A fault code “n” shows in the Center display.You can reset the controls and remove this fault code one time.To reset the controls, shut off and then start the refrigerator.- To turn off the refrigerator, push the ON / OFF button for twoseconds and then release.- To turn on the refrigerator, push and release the ON / OFFbutton.If you reset the controls and the fault occurs again before therefrigerator completes a full cooling cycle:- The heat sources to the cooling unit are turned off and arelocked out.- A fault code “n” shows in the Center display.- This time you can not reset the fault. Have the refrigeratorserviced by your dealer or a Norcold authorized ServiceCenter as soon as possible.