Fast Track Troubleshooting
Publication # tsRS277AC Revision Date 03/30/2011
Models Covered:
RS277AC**/XAA
SxS Refrigeration
IMPORTANT SAFETY NOTICE – ―For Technicians Only‖ This service data sheet is
intended for use by persons having electrical, electronic, and mechanical experience
and knowledge at a level generally considered acceptable in the appliance repair trade.
Any attempt to repair a major appliance may result in personal injury and property
damage. The manufacturer or seller cannot be responsible, nor assume any liability for
injury or damage of any kind arising from the use of this data sheet.
SUPPORT INFORMATION
Training — Plus One http://my.plus1solutions.net/clientPortals/samsung/
Help — GSPN http://service.samsungportal.com/
Samsung Product Support TV http://support-us.samsung.com/spstv/howto.jsp
Customer information videos and chat programs. Programs for Fridges, Laundry, Ranges & D/W
Self Diagnosis: Press both buttons (Power
Freeze—Power Cool) simultaneously (No
sound when both buttons are pressed at the
same time) ‘til the display quits blinking and
beeps, 8-12 seconds, then release and read
Fault Codes.
This will also cancel the Fault Mode created
by self-diagnosis at power up.
Forced Mode: Press both buttons (Power
Freeze – Fridge) simultaneously (No sound
when both buttons are pressed at the same
time) ‗til it beeps and goes blank, 8-12 seconds
Press Freezer button one
time at the Test Mode to
Force Compressor Run,
measure fan and compressor voltages at main
PCB
Press Freezer button a
second time to Force
Defrost of Fridge, measure defrost voltage at
main PCB
Press Freezer button a
third time to Force Defrost
for Fridge & Freezer,
measure defrost voltages
at main PCB
Wait 5 seconds
between button
pushes
Sales Mode, No Compressor Operation
Refrigerant Charge
R134a 7.76 oz.
Press Power Freeze & Freezer temp buttons simultaneously
for 3 sec ( you will hear a ―Ding Dong‖) to remove or put
into Sales Mode. When in the Sales Mode the Display will
show "OF" "OF"
Removing power will not cancel this mode.
Component Value Chart
Sealed System
# tsRS277AC RevB 03/30/2011
Component
Resistance Wattage Voltage
Freezer Defrost Heater
58Ω
250
120vac
Fridge Defrost Heater
103Ω
140
120vac
Dispenser Heater
2880Ω
5
120vac
Water Tank Heater
3600Ω
4
120vac
Fill Tube Heater
2880Ω
5
120vac
Sensors
2.5kΩ-89kΩ
N/A
1~4.5vdc
Fans
N/A
N/A
7~12vdc
1
FLEX TRAY Ice Makers
When the initial power is applied, the ice tray will stand by for 2
hours. After the 2-hour standby time, the Ice Maker Sensor will check
the temperature , when it is lower than 1.5℉ for more than 5 minutes,
it will do a harvest, with or without ice in the tray, then fill with water.
58 minutes after water is supplied to the Ice Tray, the Ice Maker
Sensor temperature will be checked. When the Ice Maker Sensor
maintains lower than 1.5℉ for 5 minutes, it completes the harvest
(if the ice bin is not sensed as full).
Thermistor senses temperature to determine water fill on newer units
Filling the tray
After the water fill is completed, the ice maker sensor will evaluate the
water volume one and a half minutes later. When it detects no or low
water level, it will add more water. First supply time will be 1.5 sec,
next one will be 1 sec and the last will be 2 sec.
Guide – Bin Full
Ice Maker Test Button
Ice Maker Thermistor
Shattered Ice – Flex Tray
When all ice shatters, it's because of a bad
tray or ice cube temp that is too cold (lower
than -5 degrees). In some areas, there are
water issues that can also cause shattered
cubes. The temp in the freezer should not
have any effect on this issue, as long as it’s
below 1.5 degrees F, as a properly installed
sensor will not read the freezer temp, only the
water/ice temp.
Check the Ice tray for defects in the plastic.
Ice that is too cold will shatter during
harvest. This can be from the (1) sensor not
reading the correct temp (2) or the sensor not
mounted correctly (3). By programming the
icemaker offset value to a lower number (4),
the board not understanding the reading.
To check the sensor, you must check the tray
temp (not air temp) and compare it to the sensor reading. The sensor should read 3.7 volts
at the main board connector when the cube
temperature is 1 degree. After the fill, the sensor will read water temp 1.5 to 2.2 volts.
To clear offsets, put unit into Diagnostics
mode.
Please note, some shattering is normal for
a flex tray icemaker.
FREEZER TEMPERATURE CONTROL BY THE ICE MAKER
Interior Temperature of the freezer will be set to -14 degrees Fahrenheit until the ice bucket is full. When the ice
bucket is full, the freezer will maintain original set temperature. Also, whenever the ice is used, the freezer will
again set to -14 degrees Fahrenheit. Selecting "Ice Off‖ will allow the freezer to be controlled by the set temperature. If water is not hooked up, the freezer will always be at –14 unless ―Ice Off‖ is selected.
DEFROST HEATERS
This model series uses a Defrost Sheath Heater in the Fridge and Freezer compartments, they
are separate from the evaporator coils and replaceable.
Temperature/Resistance/Voltage Chart for Samsung Refrigerators Sensors
Temp.
(Ω)
Volts
Temp.
(Ω)
Volts
Temp.
(Ω)
Volts
Temp.
(Ω)
Volts
-29.2°F
-27.4°F
-25.6°F
-23.8°F
-22.0°F
-20.2°F
-18.4°F
-16.6°F
-14.8°F
-13.0°F
-11.2°F
-9.4°F
-7.6°F
-5.8°F
-4.0°F
-2.2°F
-0.4°F
64227
61012
57977
55112
52406
49848
47431
45146
42984
40938
39002
37169
35433
33788
32230
30752
29350
4.326
4.296
4.264
4.232
4.199
4.165
4.129
4.093
4.056
4.018
3.98
3.94
3.899
3.858
3.816
3.773
3.729
1.4°F
3.2°F
5.0°F
6.8°F
8.6°F
10.4°F
12.2°F
14.0°F
15.8°F
17.6°F
19.4°F
21.2°F
23.0°F
24.8°F
26.6°F
28.4°F
30.2°F
28021
26760
25562
24425
23345
22320
21345
20418
19537
18698
17901
17142
16419
15731
15076
14452
13857
3.685
3.64
3.594
3.548
3.501
3.453
3.405
3.356
3.307
3.258
3.208
3.158
3.107
3.057
3.006
2.955
2.904
32.0°F
33.8°F
35.6 °F
37.4 °F
39.2 °F
41.0°F
42.8°F
44.6°F
46.4°F
48.2°F
50.0°F
51.8°F
53.6°F
55.4°F
57.2°F
59.0°F
60.8°F
13290
12749
12233
11741
11271
10823
10395
9986
9596
9223
8867
8526
8200
7888
7590
7305
7032
2.853
2.802
2.751
2.7
2.649
2.599
2.548
2.498
2.449
2.399
2.35
2.301
2.253
2.205
2.158
2.111
2.064
62.6°F
64.4°F
66.2°F
68.0°F
69.8°F
71.6°F
75.2°F
77.0°F
78.8°F
80.6°F
86.0°F
87.8°F
89.6°F
91.4°F
95.0°F
96.8°F
100.4°F
6771
6521
6281
6052
5832
5621
5225
5000
4861
4690
4218
4072
3933
3799
3547
3428
3204
2.019
1.974
1.929
1.885
1.842
1.799
1.716
1.675
1.636
1.596
1.483
1.447
1.412
1.377
1.309
1.277
1.213
# tsRS277AC RevB 03/30/2011
2
DC FAN MOTORS
Brushless DC Fan motors are used to save energy. The fans operate at two speeds. Fan speed information is read by
the Main PCB. If the fan speed exceeds 600 RPM or the speed is too slow, or stopped the fan drive circuit is disabled,
After 10 seconds the circuit tries again with 3 seconds of DC voltage. If the fan continues this activity for 5 cycles, 10
seconds off 3 seconds on, the fan drive circuit is disabled for 10 minutes.
TO TEST THE FAN CIRCUIT VOLTAGE.
Power off and back on to check the DC voltage to the motor, wait from 10 to 60 seconds for the fan voltage to kick in,
and then check fan voltage, the average reading is 9 VDC. If you get 3 seconds of voltage every 10 seconds for the 5
fan power up cycles, then the Main PCB is good.
NOTE: You may need to put unit in FORCED FREEZE mode to activate the fans/compressor.
If the fan blade is blocked by ice, then defrost and check the motor again, after removing power from the unit.
If the evaporator is ice blocked and thus blocking the air flow, the fan will over RPM and will be stopped. Remove ice
and check the motor again. If everything is clear around the fan blade then the motor would be at fault. Continuous fan
errors will be displayed on the front panel display. PLEASE NOTE: The door switches control the evaporator fan motors. Have them closed to test the motors. Delay time 10 – 60 seconds.
Samsung 'Refrigerator' Diagnostic Code Quick Guide
Error Items
LED
TROUBLE
TESTING
I/M-SENSOR
Ice Maker Sensor Error- open or short-circuit, connector failure. Cause is
also a temperature reading > 122°or < -58 ° F
The voltage at MAIN PCB Sensor
betw een 4.5V~1.0V
R-SENSOR
Refrigerator Room Sensor Error- open or short-circuit, connector failure.
Cause is also a temperature reading > 122°or < -58 ° F.
The voltage at MAIN PCB Sensor
betw een 4.5V~1.0V
DEFROST SENSOR OF R
ROOM
Ref. Defrost Sensor Error- open or short-circuit, connector failure. Cause is
also a temperature reading > 122°or < -58 ° F
The voltage at MAIN PCB Sensor
betw een 4.5V~1.0V
R-FAN ERROR
This error indicates the Refrigerator Evap Fan is not spinning at the correct
RPM or the fan feedback line is open.
Fan voltage at MAIN PCB shall be
betw een 7V~12V
I/M FUNCTION ERROR
This error indicates the Ice tray has not returned to level after an ice harvest.
Replace I/M
The error is displayed after three failed attempts.
COOL SELECT ZONE
SENSOR
Cool Select Zone Sensor Error- open or short-circuit, connector failure.
Cause is also a temperature reading > 122°or < -58 ° F
R-DEFROSTING ERROR
Disconnect defrost connector
Refrigerator Room defrost heater- open or short-circuit, connector failure, or
from PCB, check resistance
defective temperature fuse/bi-metal. Defrost on over 80 minutes
EXT-SENSOR
Ambient Temp. Sensor Error- open or short-circuit, connector failure. Cause
is also a temperature reading > 122°or < -58 ° F
The voltage at MAIN PCB Sensor
betw een 4.5V~1.0V
F-SENSOR
Freezer Compartment Sensor Error- open or short-circuit, connector failure.
Cause is also a temperature reading > 122°or < -58 ° F
The voltage at MAIN PCB Sensor
betw een 4.5V~1.0V
F-DEF-SENSOR
Freezer Room Defrost Sensor Error- open or short-circuit, connector failure. The voltage at MAIN PCB Sensor
Cause is also a temperature reading > 122°or < -58 ° F
betw een 4.5V~1.0V
F-FAN ERROR
This error indicates the Freezer Evap. Fan is not spinning at the correct RPM Fan voltage at MAIN PCB shall be
or the fan feedback line is open.
betw een 7V~12V
C-FAN ERROR
This error indicates the Condenser Fan is not spinning at the correct RPM or
the fan feedback line is open.
Fan voltage at MAIN PCB shall be
betw een 7V~12V
F-DEFROSTING ERROR
Freezer defrosting heater- open or short-circuit, connector failure, or
defective temperature fuse/bi-metal. Defrost on for over 80 minutes
Disconnect defrost connector
from PCB, check resistance
Uart ERROR
COMMUNICATION
This error is not applicable, if the error is detected during diagnostic testing
please ignore it.
No Repair Necessary
L-M ERROR
COMMUNICATION
Communication error w ithin the Main PCB
Replace main PCB
P-M ERROR
COMMUNICATION
Communication betw een the Main PCB and Keypad
Check w iring in door & cabinet,
Panel PCB, Main PCB
# tsRS277AC RevB 03/30/2011
The voltage at MAIN PCB Sensor
betw een 4.5V~1.0V
3
CN= Connector # for measuring voltages; () means go to connector #, pin # shown in () for voltage common.
CN30 Sensors & Switches Component Name
4-(CN76-1) F Def Sensor (Org-Gry) 2.3~4.2vdc
Voltage on operating component
Pin #s & wire colors on each connector to measure voltages
Key To Read PCB Layout
CN70 120vac
1-11 Water Tank (Blu-Red)
5-11 Compressor & Dispenser Heater (S/Blu-Red)
9-7 R-Def/Ice Pipe HTR (Wht-Org)
13-7 F-Def HTR (Brn-Org)
CN71 120vac
1-(CN70-11) Cube Solenoid (Yel-Red)
3-(CN70-11) Auger Mtr (Pnk-Red)
5-(CN70-11) Ice-Motor Solenoid (Prp-Red)
7-(CN70-11) Water Solenoid (W/Blk-Red)
CN51 Cool Zone
13-14 Cool Zone Sensor (W/Red-W/Blu) 2.6~2.8vdc
12-13 (W/Blk-W/Red) 12 VDC
CN90 Ice Maker
1-2 I/M Motor (Red-Blk) 12vdc
3-4 I/M Sensor (Wht-Wht) 2.3~3.3vdc
5-8 Test Sw (Gry-S/Blu) 5vdc
6-8 Horizontal Sw (Blu-S/Blu) 5vdc
7-8 Check Sw (Prp-S/Blu) 5vdc
CN50 Panel Display
CN30 Sensors
1-2 F Door SW (W/Red-Brn) 5vdc
5-6 R Door SW (W/Blu-Brn) 5vdc
3-2 F Sensor (Yel-Brn) 3.5~4.2vdc
4-2 F-Def Sensor (Blu-Brn) 2.3~4.2vdc
7-6 R Sensor (Gry-Brn) 2.4~2.8vdc
8-6 R-Def Sensor (Prp-Brn) 2~4.2vdc
9 -10 Water Sw (Wht-Blk) 120vac
CN31
1-4 Ambient Sensor (Wht-Wht) 1.2~2 vdc
2-3 Ice SW (Org-Org) 5vdc
CN10 Transformer
1-3 (Blk-Red) 120 VAC
CN72
6-7 F-Fan (Yel-Gry) 7~11vdc
5-7 R-Fan (Org-Gry) 7~11vdc
4-7 C-Fan (S/Blu-Gry) 7~11vdc
3 F-Fan control (Blk)
2 R-Fan Control (Brn)
1 C-Fan Control (Red)
# tsRS277AC RevB 03/30/2011
CN73
1-2 Damper Heater (Blk-Blk) 12vdc
3-4 Coil Damper Mtr (Wht-Blu)
5-6 Coil Damper Mtr (Yel-Red)
4
# tsRS277AC RevB 03/30/2011
5