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Refrigerator Service ManualN6XX/N8XX Models
Canister Door
DC Heater Tube
AC Heater Tube
AC Heater
DC Heater
When poor or no cooling in AUTO AC or AC-Manual
Mode, operation is present:
1. Measure AC voltage input to the power board.
2. Measure heater amp draw.
3. If amp draw is not as specified, measure the
heater's resistance at ambient temperature.
When replacing an AC heater make sure the stop bead
rests fully against heater tube rim. See Figure 22.
AC Heater Circuit Fuse
The AC circuit fuse is a fast acting 5 amp
1
/
4
" x 1
1
/
4
"
AGC type. It is on the power board, terminal F3.
Lamp Assembly
The operation of the fresh food compartment 12 Vdc
lamp is controlled by a magnet activated reed relay
switch. The switch is in the optical control circuit
board and the magnet is permanently mounted on the
underside of the door's top trim piece.
Leaving the door ajar or open for more than two
minutes causes the controls to display a "d" or "dr"
fault code (depending on unit model). Closing the door
turns off the light and clear the "d" or "dr" fault
indicator from the display. However, the fault code will
be stored in the diagnostic mode nonvolatile memory.
For "d"/"dr" troubleshooting procedures. See page 19.
As shown in Figure 21, the light assembly harness
and thermistor share the same connector. Remove the
light cover to access the connector.
Divider Heater
The divider heater is permanently "foamed" between
the divider separating the freezer and fresh food
compartment. The controls constantly monitor power
board voltage output to the heater through built in
diagnostics. Turning the refrigerator on automatically
powers the heater.
The AC heater, see Figure 22, is a cartridge type
heater. Refrigerators with serial number lower than
854647 heater is rated for 300 Watts/2.7 amps @ 110
Vac and has a resistance of 41.25 ohms. Refrigerators
with serial number 854647 and higher heater is rated
for 300 Watts/2.5 amps @ 120 Vac. Heater
resistance is 48 ohms.
AC Power Requirements
!
WARNING:
Electric shock hazard! The refrigerator is fed power
from more than one source. Unplug the AC cord from
the RV AC receptacle before servicing electrical or
electronic components.
AUTO AC and AC-Manual Mode operation requires 108
to 132 Vac. AC power must be supplied through a 2
pole/3 wire/20 amp grounding type receptacle.
AC Heater
Figure 20. AC and DC Heaters (3-way refrigerator)
Figure 21. Lamp/Thermistor Assembly.
!
WARNING:
Do not wire the heater(s) direct! Wiring heater(s)
direct bypasses control safety devices and creates
the potential for an electrical fire.
Figure 22. AC Heater.
Stop Bead
Black Wire Leads
Connector
Light bracket
Lightbulb
Light cover
N641/N841
Thermistor
Clip