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6-7
PROBLEM POSSIBLE CAUSE
TEST PROCEDURE—ACTION
Will not defrost.
Refrigerator too cold or
too warm.
Defrost heater.
Defrost bimetal / thermofuse.
Control board.
Air door may be stuck or frozen
open.
User interface may be malfunc-
tioning.
Check air door operation.
Unplug refrigerator or disconnect power.
Check resistance of refrigerator thermistor.
Replace user interface.
Defrost can be initiated by disconnecting and
reconnecting power. Main control board will
attempt to initiate defrost upon restart:
• If bimetal is closed, defrost cycle will start.
Relay on main control board will click one
time.
• If bimetal or defrost circuit is open, defrost
cycle will not start, and the cooling cycle
will begin. Relay on main control board will
click twice (once to initiate defrost and the
second time to switch back to cooling).
Unplug refrigerator or disconnect power.
Refer to “Component Testing” on page 5-2.
Check for continuity through heater, bimetal,
and thermofuse.
Check for loose electrical connections.
If all checks out, replace the main control
board.