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Over-Temperature Thermostat
The over-temperature thermostat is in a series
circuit with the defrost heater and return duct
heaters. Once the temperature of the thermostat
reaches 140°F, the thermostat cycles the defrost
heater and the return heaters off.
Remove the evaporator cover to access the over-
temperature thermostat. (See
Evaporator
.) The
thermostat is clipped onto the suction line.
Return Duct Heaters
A return duct heater has been added to each of
the 2 fresh food compartment return air ducts. The
heaters prevent water from freezing and blocking
the air
fl
ow in the ducts. Restricted ducts can cause
warm fresh food temperatures. (See
Airfl ow
.)
Return Duct
Outlets
The heaters operate with 120 VAC and each heater
has an approximate resistance value of 440
Ω
. The
heaters are in a parallel circuit consisting of 2 duct
heaters and the defrost heater. The line voltage
wires of the duct heaters are connected to the
blue wire of the defrost heater. The neutral wires
of the heaters go through the over-temperature
thermostat. The 2 duct heaters are energized (along
with the defrost heater) during the defrost cycle
when the over-temperature thermostat is closed.
Return Duct Heaters Test
If open duct heaters are suspected, perform the
following:
1. With the over-temperature thermostat closed,
test for approximately 30
Ω
(the equivalent
resistance of this parallel circuit) between J9
and J7-9.
2. For a resistance reading other than
approximately 30
Ω
, remove the evaporator
cover. (See
Evaporator
.) Remove the Phillips-
head screw and the mullion wire harness cover
from the freezer left-side wall. Disconnect the
left-side wire (blue wire) from the defrost heater.
Insert a volt ohmmeter into the disconnected
defrost heater wire. Insert the other lead into the
orange wire connection of the mullion heater. A
reading of approximately 220
Ω
indicates both
heaters are good.
Note:
The return duct heaters are integral to
the foamed-in-place internal ductwork of the
refrigerator and are not replaceable.
Silicone Grease
Note:
When replacing the over-temperature
thermostat, splice a new thermostat into the wiring
using connectors and procedures approved for
damp/wet conditions.
Clip
Over-temperature
Thermostat
ORANGE
ORANGE
NEUTRAL OUTPUT
ORANGE
ORANGE
PINK
DEFROST
HEATER
OVER TEMPERATURE
THERMOSTAT
BLUE
RETURN DUCT
HEATER LH
RETURN DUCT
HEATER RH
J7-9
J9(TAB-2)
MAIN CONTR
OL BO
ARD
R=31.2
R=440
R=440
BLUE
PINK
BLUE
PINK
ORANGE