www.norcold.com/cda
49
NX6 / NX8 / NXA Models
Refrigerator Service Manual
When troubleshooting poor or no cooling in AUTO DC or DC-
Manual Mode, always check DC voltage input to the power
board, voltage output to the heater, and heater amperage
draw. If DC voltage input to the refrigerator is lower than
12VDC, the problem is usually related to the DC power
supply source. The RV DC power supply source may not be
supplying the correct voltage to the power board.
When troubleshooting poor or no cooling in AUTO LP mode or
LP-Manual Mode, always check the burner
fl
ame appearance
fi
rst. Most faults on LP gas operation relate to a "dirty burner."
Refrigerant Leakage
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
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.
Do not, under any circumstances, release any waste or
residue directly into sewers, or surface waters. If any liquid
leaks or spills from the cooling unit, contact the nearest
environmental services for guidance.
Poor or No Cooling on DC Mode – 3-Way Models
Troubleshooting Cooling Faults
A high percentage of cooling units returned labeled “faulty” are
fully operational units. To troubleshoot cooling units see Fig.
40.
When troubleshooting poor or no cooling in AUTO AC or AC-
Manual Mode,
fi
rst check AC voltage input to the power board,
then check voltage output to the heater, and the heater's
amperage draw.
AC voltage problems, high or low voltages, can be caused
by the RV AC power supply circuit. To troubleshoot AC faults,
refer to the Fault Codes section in this manual.
Poor or No Cooling on LP Gas Mode
Poor or No Cooling on AC Mode
Cooling Unit - cont’d.
!
WARNING
The thermal switch is not intended to be reset more
than once. Multiple trips of thermal switch may
indicate a more serious over-temperature condition
inside the cooling system and must be handled by an
authorized Norcold Service technician.
!
WARNING
Do not work on live circuits!
Turn off and disconnect
AC power and DC power supplies before attempting
to remove, service, or repair any of the refrigerator's
electrical or electronic circuits or components.
!
WARNING
Do not work on live circuits!
Turn off AC power and
DC power before attempting to remove, service, or
repair any of the refrigerator's electrical or electronic
circuits or components.
!
WARNING
LP gas (propane) is highly flammable and
explosive!
Do not smoke, light
fi
res, or create sparks
when working on the LP gas system.
Do not use an open
fl
ame to leak test any propane
gas system component.
!
WARNING
Do not operate the refrigerator if the cooling unit is
leaking or leakage is suspected.
