SERVICE MANUAL
27
www.norcold.com
A 120 volt AC heater generates the heat load required for AUTO AC
and Manual AC operation. To replace the heater, the refrigerator
must be removed from the enclosure.
Burn hazard! Allow canister and heater
to cool before attempting to remove and
replace.
The AC electric heater will cycle in response to the fin temperature
to maintain the cabinet temperature.
ATTENTION
!
WARNING
Fault Code Flash Patterns - N7X and N8X
Models
The N7X and N8X controls have the ability to recognize various
fault conditions and will display a unique error/fault code accord-
ingly.
Should none of the heat source inputs be available, the power ON /
indicator light (See Fig. 14, D) will be solid RED.
ALL other fault codes will be displayed using flash patterns. The
term “flash pattern” means the power ON / indicator light is turned
ON and OFF to create a numeric pattern. These flash patterns di
-
rectly correspond to particular fault codes. For example, fault code
3 will be indicated by flashing the power ON / indicator light RED
3-times, followed by a 5-second pause, and then repeated as long
as the fault condition is present (See Fig. 13).
The refrigerator is not cooling if the power
ON / indicator light [185] is either on solid
RED or flashes on RED.
NOTICE
Air in the Propane Gas Supply Lines
For safety reasons, the refrigerator elec-
tronic controls are designed so that while
operating in Propane Gas Mode, the trial
for ignition (the maximum time that the
gas valve and the igniter can be left on
without a flame present) is limited to 30
seconds. When starting the refrigerator for
the first time, after storage, or after replac
-
ing the propane gas tanks(s), the propane
gas supply lines can have air in them.
Due to the air in the gas supply lines, the
burner may not ignite within the 30 second
time limit. If this happens, the gas valve
and igniter outputs will be turned off, the
propane gas mode will be “locked out”,
and the appropriate fault code will show in
the display.
The gas lock out condition can be reset
by powering the refrigerator OFF and
back ON, at which time a new 30 second
trial for ignition will begin. You may need
to repeat this procedure several times to
remove all of the air from the gas supply
lines.
NOTICE
Diagnostic Prechecks
Diagnosing fault codes begins by starting with the basics. In many
cases, the problem can be solved by verifying the unit is operating
in acceptable conditions:
1. The refrigerator is plugged into a known working AC outlet
with a voltage between 108VAC and 132VAC
2. Extension cords are not being used to supply AC power to
the refrigerator
3. The refrigerator is connected to a known working DC power
supply and/or battery supplying between 10.5 and 16.0 VDC
4. Propane gas is available to the refrigerator and is regulated
between 10.5 and 11.5” WC (Inches of Water Column)
USER INTERFACE (Controls) - N7X and N8X Models, cont’d.
FAULT CODES - N7X AND N8X MODELS
