Table of Contents
Advertisement
Section C - Electrical Components
DEFROST THERMOSTAT
The defrost thermostat is a temperature sensing device. Wired
in series with the electronic control board and the evaporator
defrost heater, it senses the rise in evaporator temperature
during a defrost cycle and cycles the defrost heater off after all
frost is melted. It is calibrated to permit a defrost cycle only
when the temperature is below a preset temperature. The
contacts in the defrost thermostat are set to open at 47°F and
close at 25°F.
To Test The Defrost Thermostat
1.
Measure resistance across two thermostat leads at
connector plug. At room temperature, resistance should
be infinity. The contacts are open.
2.
Place a couple ice cubes on sides of thermostat. After a
few seconds, thermostat should reset.
3.
Measure resistance again. This time, reading should be 0.
Contacts have closed.
4.
If you get resistance readings that differ from this
procedure, replace defrost thermostat. Contacts are
probably burnt.
To Remove The Defrost Thermostat
1.
Disconnect refrigerator from electrical supply.
2.
Remove freezer section bottom shelves and baskets.
3.
Remove ice container and rail assembly. The
multiconnector at the back of the rail assembly must be
disconnected before rail assembly will come free.
4.
Loosen two screws holding ice maker to right side of
compartment just enough to lift ice maker free. The multiconnector must be
disconnected before ice maker will come free from compartment.
5.
Remove two rail assembly supports (two screws on each one).
6.
Remove four screws from evaporator cover.
7.
Remove five screws on evaporator air duct cover.
8.
Cut two leads coming from thermostat close to base. You must leave enough
wire coming from connector to allow for splicing in new thermostat.
1 9
Ice Maker Duct
Air Duct Cover
Hole Plug
Seal
Evaporator Cove
Figure C6
Hide quick links:
Advertisement
Table of Contents
