KitchenAid 2003 M Technical Education page 79

COMPONENT
FC or RC compartment too warm.
FC or RC compartment too cold.
No display, no interior lights, can not
change settings.
Main Control
Board
Product does not run.
Evaporator fan motor does not run.
Touch / Display No display, no interior lights, can not
Board change settings.
Temperatures are 48°F in the RC, or 15°F
Overtemp Alarm
in the FC for more than 1-1/2 hrs.
Inoperative.
Refrigerator (RC)
Thermistor
Reversed wiring.
RC = Refrigerator Compartment
FC = Freezer Compartment
SYMPTOM
6-9
TEST PROCEDURE/ACTION
Check for loose terminals or connectors at
the main control board. Voltage should be
present at the respective pin of the respec-
tive connector of the main control board
during operation (see the diagram on page
7-2 for component and pin locations). If the
proper voltage to the component in question
is not present from the respective pin loca-
tion on the main control board during opera-
tion, replace the main control board.
Voltage should be present at pins 2 & 3 and 4 &
5 of connector 5 of the main control board dur-
ing operation (see the diagram on page 7-2).
This connection supplies the main control board
with power. If the proper voltage to the main
control board is not present, check cabinet
wiring and power cord. If the proper voltage to
the main control board is present and the prod-
uct still does not run, replace the main control
board.
Jump the red to yellow wire in the evapora-
tor fan motor harness to check the 12 VDC
fan operation. If the fan runs after jumping
the wire, replace the main control board.
Verify Touch/display board connection and
wiring to the cabinet.
The overtemp alarm is a visual and audio
signal that alerts the customer to unaccept-
ably warm temperatures in either compart-
ment for more than 1-1/2 hours. The trigger
points are 48°F in the RC, or 15°F in the FC.
The corresponding temperature display will
flash to indicate the problem compartment.
The audio alarm stops if the temperatures
return to normal but the visual alarm will
continue to flash until reset.
Check wires and connectors. Thermistor
may be out of range. Run control diagnostics
to check the RC thermistor operation in step
2. Check resistance given in the diagram on
page 7-2. If the thermister circuit is open the
control will initiate default run time to hold
temps until service can be performed.
Although extremely remote, the thermistor
wires can be reversed in the connector at
the main control boards. A quick way to con-
firm this is to remove the RC thermistor,
initiate control diagnostics and look for a "2"
in step 2, which is an indication of an open
circuit for the RC thermistor.