Set The Controls To Manual Mode Operation; Cooling Unit Sensing - Norcold N621 Owner's Manual

- If 120 volts AC is not available to the refrigerator:
- The letters "AU" and then "AC" show in the center
display.
- After five seconds, the "AU" and then "LP" show in the
center display.
- After ten seconds, the "AU" and the "LP" go off and only
a green power ON light remains.
- This means that the refrigerator is operating on
propane gas.
- On 2-way models only, if neither 120 volts AC nor propane
gas is available to the refrigerator:
- The fault codes "no" "AC" and then "no" "FL" show in
the center display and an audible alarm sounds.
- On 3-way models only, if neither 120 volts AC nor propane
gas is available to the refrigerator:
- The refrigerator control will automatically change to DC
electric operation.
NOTE: DC electric operation is less efficient than AC
electric and propane gas. Use DC electric
operation only to maintain the refrigerator
temperature while in transit and if the other
energy sources are not available. Do not use
DC electric to initially decrease the temperature
of the refrigerator.
If an energy source is available to the refrigerator, but is not
operating correctly:
- A fault code shows in the center display.
- The refrigerator controls try to change to a less efficient
energy source.
- If a less efficient energy source is not available:
- An audible alarm starts.
- 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 letters " AC" show
in the center display and then release.
- After ten seconds, the "AC" goes off and only a green
power ON light remains.
Owner's Manual 10
- Push and hold the MODE button until the letters "LP" show
in the center display and then release.
- After ten seconds, the "LP" goes off and only a green
power ON light remains.
- Push and hold the MODE button until the letters " dC" show
in the center display and then release.
- After ten seconds, the "dC" goes off and only a green
power ON light remains.
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 the
cooling unit. If the controls sense that the cooling unit has
stopped cooling:
- The heat sources to the cooling unit are turned off and are
locked out by the controls.
- An audible alarm starts.
- A fault code "no" "co" 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 one
second and then release.
- To turn on the refrigerator, push and release the ON / OFF
button.
If you reset the controls and the fault occurs again before the
refrigerator completes a full cooling cycle:
- The heat sources to the cooling unit are turned off and are
locked out.
- An audible alarm starts.
- A fault code "no" "co" shows in the Center display.
- This time you can not reset the fault. Have the refrigerator
serviced by your dealer or a Norcold authorized Service
Center as soon as possible.