Defrost Heater; Icemaker Fill Tube Heater; Return Duct Heaters - GE Profile PDCF1NBW Technical Service Manual

Defrost Heater

The defrost heater is a single-tube, glass-enclosed
radiant heater. It is held in place by 2 tabs on the
evaporator (1 on each side) and by a ceramic and
wire support.
To remove the defrost heater:
1. Access the freezer evaporator. (See
Note:
• During defrost, the heat conducting clip assists
in preventing the drain from icing closed. During
assembly, the clip must be installed on the
evaporator and inserted in the drain to prevent
drain freeze-up.
• A ceramic and wire support prevents the heater
from sagging and touching the metal drain
trough if the glass is broken.
2. Remove the ceramic and wire support and the
heat conducting clip from the evaporator.
Ceramic and Wire
Support
3. Bend the aluminum tabs back (located at each
end of the defrost heater) and lower the heater
out of the evaporator.
4. Disconnect 2 lead wires and remove the heater.

Icemaker Fill Tube Heater

The fi ll tube heater is energized during the
defrost cycle when the defrost thermostat is
closed. Remove the evaporator cover to access
the icemaker fi ll tube heater. (See
Disconnect the fi ll tube heater wire harness. The
resistance of the fi ll tube heater is approximately
2644 Ω.

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
.)
Evaporator
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, icemaker fi ll tube heater, and the
defrost heater. The line voltage wires of the duct
heaters and the fi ll tube heater 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 and the fi ll tube
heater are energized (along with the defrost heater)
during the defrost cycle when the over temperature
thermostat is closed.
Return Duct Heaters Test
Heat Conducting
If open duct heaters are suspected, perform the
Clip
following:
1.
2.
Note: The return duct heaters are integral to the
foamed in place internal ductwork of the refrigerator
.)
Evaporator
and are not replaceable.
– 46 –
Return Duct
Outlets
With the over temperature thermostat closed,
test for approximately 27 Ω (the equivalent
resistance of this parallel circuit) between J9
and J7-9 .
For a resistance reading other than
approximately 27 Ω, remove the evaporator
cover (See .), disconnect the fi ll tube
Evaporator
heater, and one lead from the defrost heater.
Insert a volt ohm meter into the fi ll tube heater
receptacle. A reading of approximately 220
ohms at 70°F indicates both heaters are good.
.)
Airfl ow