Before testing the interlock switch, unplug the
freezer to avoid an electrical shock hazard.
The interlock switch prevents various
components from functioning when the door is open. For example,
an automatic ice through the door dispenser should not operate
when the door is open. If it did, the ice would spill onto the
floor. If this switch malfunctions, it can cause improper function
by either disabling features or failing to safeguard against their
use when the door is open.
The switch may be shared with the
door's light switch, but more often it has its own separate switch.
The switch may be mounted near the light switch or it may be on
the door itself, possibly near the bottom, out of view.
Locate the switch and remove it by removing
the retaining screw (if any) or by prying it with a putty knife.
Place a piece of masking tape over the blade of the putty knife
to prevent damage to the freezer. Gently pull the switch from
its housing and expose an inch or two of wire.
The switch will be connected by
two wires (four wires if it also controls the light). Label the
wire placement on the switch before disconnecting the wires. The
wires are connected to the switch with slip on connectors. Firmly
pull the connector off of the switch terminal (do not pull on
the wire). You may need to use a pair of needle-nose pliers to
remove the connectors. Inspect the connectors and the terminals
for corrosion. If the connectors are corroded they should be replaced.
Before testing the interlock switch, unplug the
freezer to avoid an electrical shock hazard. 
