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26
Refrigerator Service ManualN611v, N811v Models
COOLING UNIT
Cooling System Monitoring
Hardware Monitoring
All refrigerators are factory equipped with a high limit thermal
switch mounted to the insulation canister just above the burner
box. Should an abnormally high temperature occur the thermal
switch will OPEN. Anytime the thermal switch opens, the
electronic controls will disable ALL heat source outputs and
the Open High Limit error/fault code will be displayed on the
optical display (Refer to Fault Codes page 12).
Reset the thermal switch by pressing the red reset-button
located between the two terminals on the back of the switch.
Refer to Fig. 23. When successfully reset, the resistance
between the two terminals will be less than 1 ohm.
NOR000096A
Fig. 23 - Reset Pushbutton
When troubleshooting poor or no cooling, 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.
Troubleshooting Cooling Faults
A high percentage of cooling units returned labeled “faulty” are
fully operational units. To troubleshoot cooling units see Fig.
24.
When troubleshooting poor or no cooling, 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 Fault Codes on page 12.
Poor or No Cooling on LP Gas Mode
Poor or No Cooling on AC Mode
!
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:
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.
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