We had a defrost problem on a refrigerator 90 days ago. WE DEFROSTED EVAPORATOR – REPLACED EVAPORATOR THERMISTER AND MOTHER BOARD . Now we went back out for a no cool, compressor was not running cycling on and off on overload. We replaced the mother board and the compressor started running perfect amperage. The only issue now is the lights in the fresh food and freezer flicker on and off every 5- seconds. We tried a second board with same symptoms. We checked all connections and harnesses including the new thermistor we replaced. We unplugged the display thinking there may be a short with no success. Has any member seen this issues or have any suggestion on a direction to move forward ? Thanks in advance. Matt
- Harley Clark asked 10 years ago
You have a shorted low voltage component. Start unplugging the the components individually Evaporator motor, auger motor and see if the lights stop flickering. We had one with a shorted auger motor that gave us the exact symptom. See diagnostic chart.
START – OPEN FF DOOR
YES
NO
NO
C
YES
CAN YOU SEE TEMP SETTINGS LIGHT UP NEAR TOP OF DOOR?
VERIFY TURBOCOOL
OFF. IS UNIT A CUSTOM
COOL MODEL?
PRESS EITHER COLDER OR
WARMER BUTTON ONCE ON
FF TEMP. IS TEMP DISPLAYED
37 DEG F +/- 2 ?
PRESS EITHER COLDER OR
WARMER BUTTON ON FF TEMP.
CAN YOU CHANGE SETTINGS?
PRESS EITHER
COLDER OR WARMER
BUTTON ON FZ TEMP.
IS TEMP DISPLAYED 0
DEG F +/- 2 ?
PRESS EITHER
COLDER OR
WARMER BUTTON
ON FZ TEMP. CAN
YOU CHANGE
SETTINGS?
PRESS DOOR SWITCH ON
BOTTOM RIGHT OF FF CASING.
CAN YOU HEAR FAN START AND
DOES THE LIGHT TURN OFF?
PRESS EITHER COLDER OR
WARMER BUTTON ON FF TEMP.
CAN YOU CHANGE SETTINGS?
YES
REFRIG MAY NOT BE
IN COOLING CYCLE.
LEAVE DOOR OPEN
FOR 3 MIN. DID EVAP
FAN COME ON?
YES
PRESS EITHER COLDER OR
WARMER BUTTON ON FZ TEMP.
CAN YOU CHANGE SETTINGS?
CHANGE
SETTING TO 0
DEG F
(CUSTOMCOOL
MODELS) OR 5
(NONCUSTOMCOOL
MODELS)
NO
NO
IS FF SETTING DISPLAYED 5 +/- 1 ?
YES
YES
NO
NO
NO
IS FZ SETTING
DISPLAYED 5 +/- 1 ?
C
YES
PRESS EITHER COLDER OR WARMER BUTTON
ON FF TEMP. CAN YOU CHANGE SETTINGS?
CHANGE
SETTING TO 5
CHECK FOR
BROWN SPOT
ON MAIN
BOARD (R95
RESISTOR)
VERIFY THAT ALL
PANS/SHELVES
ARE SEATED
VERIFY NO DOOR
OBSTRUCTIONS
VERIFY ICE
BUCKET SEATED
ALL WIRING AND
WIRING
CONNECTIONS OK?
REPLACE
TEMP BOARD
AND ALSO
MEMBRANE (IF
MEMBRANE
VERSION)
NO
VERIFY VOLTAGE OUTPUT
ON MAIN BOARD TO DAMPER
PER TECH MANUAL REPLACE
DAMPER
REPAIR/REPLACE WIRING
AND/OR CONNECTIONS AS
NEEDED. PROBLEM SOLVED?
NO
YES
DO
DISPENSER
FUNCTIONS
WORK?
CHECK EVAP FAN FOR
OBSTRUCTION, DAMAGE,
WIRING CONNECTIONS
REPLACE
MAIN BOARD
NO
D
NO
YES
OK
NO
GOOD
CHECK
VOLTAGES TO
FAN FROM MAIN
BOARD
OK
NO
GOOD
CHECK EVAP FAN.
NO IS IT ICED UP?
FIX EVAP FAN
PROBLEM
YES
NO
OK
NO
GOOD
A
A
B
B
E
PRESS EITHER COLDER OR
WARMER BUTTON ON FF TEMP.
CAN YOU CHANGE SETTINGS?
NO
YES
END
YES
CONTACT
TAG TEAM
RESOLVE
ICING ISSUE
NO GOOD OK
REPLACE
EVAP FAN
REPLACE
EVAP FAN
CIRCLE NODES:
FOLLOW THE
ARROWS – EXAMPLE:
A A THEN
GO TO
YES
NO
YES
ARE LIGHT BULBS IN
COMPARTMENT LIT?
CHECK DC
POWER
CONNECTION
AT MAIN
BOARD
OK
CHECK POWER CORD
AND HOME CIRCUIT
BREAKER / FUSE. OK?
CHECK
CONNECTIONS
IN MACHINE
COMPT NEAR
WATER VALVE
NO
GOOD
CHECK FUSE
ON MAIN
BOARD
OK
NO
GOOD
REMOVE ALL DC
OUTPUT
CONNECTIONS
FROM MAIN
BOARD AND
CHECK 12V ON
THE BOARD
OK
MEASURE
RESISTANCE OF
THERMISTORS
NO
GOOD
OK
REPLACE
BAD
THERMISTOR
YES
FIX MAIN
BOARD
CONNECTION
PROBLEM
NO
FIX HOME
ELECTRICAL
PROBLEM OR
HAVE
CUSTOMER
CALL
ELECTRICIAN
OK
NO
GOOD CHECK
BOTH
DOOR
SWITCHES
REPAIR OR
REPLACE
WIRING AND/OR
CONNECTIONS
AS NEEDED.
PROBLEM
SOLVED?
END
REPLACE
REFRIGERATOR
YES
NO
NO
GOOD
E
CHECK AC
POWER
CONNECTION AT
MAIN BOARD
OK
NO
GOOD
OK
CONTACT
TAG TEAM
NO
GOOD
CHECK FOR
SHORT
BETWEEN FAN
MOTORS AND ON
CONNECTOR J4,
PINS
- AV Repair Help answered 10 years ago
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