Second "N" Fault Code; Cooling Monitoring Control Operation; First "N" Fault Code; Refrigerant Leakage - All Models - Norcold N500 Service Manual

Cooling Monitoring Control Operation

Cooling Monitoring operates in the following sequence:
1. Because the fin temperature is above 40° F when
the refrigerator is turned ON, sampling begins
when the refrigerator is turned ON and stops
when the temperature falls below 40° F.
2. Monitoring activates if the fin temperature rises
above 40° F while the refrigerator controls are
demanding cooling.
3. Monitoring samples the fin temperature every ten
minutes for a period of two hours.
4. If there is no decrease in temperature in this two-
hour time period, Monitoring turns off the active
refrigeration heat source.
5. After ten minutes, Monitoring restarts the heat
source and monitors the fin temperature every ten
minutes for another 40 minutes.
6. Within this 40-minute time period the temperature
must decrease or Monitoring will turn off the
refrigerator and lock out the heat sources.
7. Once the heat sources are locked out, the optical
control assembly displays the "n" fault code.

First "n" Fault Code

The first time the "n" fault code (no cooling) is
displayed, it can be cleared by the user by turning the
refrigerator OFF and then back ON. This gives the user
the opportunity to check for problems that may have
caused an "n" code, such as obstructed ventilation. This
fault code occurrence is then stored by the controls. If
the refrigerator completes a full cooling cycle after it is
turned back on, this fault code occurrence will be
erased from the controls.
An "n" fault code occurrence is not stored in the built-in
diagnostic stored fault history accessible through the
Diagnostic Mode. Instead it is stored in a separate,
unaccessible stored fault history.

Second "n" Fault Code

If the refrigerator does not complete a full cooling cycle
after the user turns the refrigerator back on, a power
board reset is required. To reset the power board, see
page 20.
Refrigerator Service Manual
NOTE
www.norcold.com/cda
!
Do not operate the refrigerator if the cooling unit is
leaking or leakage is suspected.

Refrigerant Leakage - All Models

Yellow powder or liquid deposits at the rear of the
refrigerator or ammonia smell inside the refrigerator
indicate refrigerant leakage. Exercise extreme care
when handling a leaking or a suspected leaking cooling
unit. The cooling system refrigerant solution consists of
water, ammonia, sodium hydroxide, and sodium
chromate.

Disposal of Cooling Unit - All Models

!
Do not, under any circumstances, release any waste
or residue from the cooling unit directly into sewers or
surface waters. If any liquid leaks or spills from the
cooling unit, contact the nearest environmental services
for guidance.
Dispose of cooling unit according to local, state, and
federal guidelines and regulations. Dispose of any liquid
waste or residue according to pre-emergency planning
and all applicable local, state, and federal regulations.
Any cooling system replaced under the NORCOLD
warranty procedure must be returned to NORCOLD per
the instructions included with the replacement system.
WARNING:
WARNING:
N500/N510 Models
33