Samsung RM255 series User manual

Fast Track Troubleshooting
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.
Models Covered:
RM255****
4 Door Refrigeration
Wait 5 seconds between button pushes
Self Diagnosis: Press both buttons (Freezer–
Fridge) simultaneously (No sound when both
buttons are pressed at the same time) ’til the
display quits blinking and beeps, 8-12 sec-
onds, 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 (Freezer–
Fresh Select Zone) simultaneously (No
sound when both buttons are pressed at
the same time) ‘til it beeps and goes blank,
8-12 seconds
Publication # tsRM255 Creation Date 08/24//2009
Component Value Chart
Component Resistance Wattage Voltage
Freezer Defrost Heater 72200 120vac
Fridge Defrost Heater 18080 120vac
CF Defrost Heater 144100 120vac
CR Defrost Heater 18080 120vac
F Drain Tube/Heater 28805 120vac
R Drain Tube/Heater 28805 120vac
Dispenser Heater 28805 120vac
Water Tank Heater 295 12vdc
Fill Tube Heater 295 12vdc
Sensors 2.5k-89kN/A 1~4.5vdc
Fans N/A N/A 7~12vdc
1. Compressor Sub-condenser Hot Pipe Back Clus-
ter Pipe Dryer R Capillary Tube Refrigerator Evapo-
rator /CR EvaporatorConnected Capillary Freezer
Evaporator/CF Evaporator Suction Pipe Compressor
2. Compressor Sub-condenser Hot Pipe Back Clus-
ter Pipe Dryer F Capillary Tube Freezer Evaporator/
CF Evaporator Suction Pipe Compressor
Press Freezer button one
time at the Test Mode to
Force Compressor Run,
measure fan and com-
pressor voltages at PCB
Press Freezer button a
second time to Force
Defrost of Fridge, meas-
ure defrost voltage at
main PCB
Press Freezer button a
third time to Force Defrost
for Fridge & Freezer,
measure defrost voltages
at main PCB
Refrigerant
Charge
R134a
7.76 oz
Sales Mode, No Compres-
sor Operation: Press
Freezer & Arctic Select
Zone buttons simultane-
ously for 3 sec ( you will
hear a “Ding Dong”) to re-
move or put into Sales
Mode. When in the Sales
Mode the Display will show
"OF" "OF"
Removing power will not
cancel this mode.
Sealed System
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 tem-
perature. If water is not hooked up, the freezer will always be at –14 unless “Ice Off” is selected.
1

Temperature/Resistance/Voltage Chart for Refrigerators Sensors
Temp. () Volts Temp. () Volts Temp. () Volts Temp. () Volts
-29.2°F 64227 4.326 1.4°F 28021 3.685 32.0°F 13290 2.853 62.6°F 6771 2.019
-27.4°F 61012 4.296 3.2°F 26760 3.64 33.8°F 12749 2.802 64.4°F 6521 1.974
-25.6°F 57977 4.264 5.0°F 25562 3.594 35.6 °F 12233 2.751 66.2°F 6281 1.929
-23.8°F 55112 4.232 6.8°F 24425 3.548 37.4 °F 11741 2.7 68.0°F 6052 1.885
-22.0°F 52406 4.199 8.6°F 23345 3.501 39.2 °F 11271 2.649 69.8°F 5832 1.842
-20.2°F 49848 4.165 10.4°F 22320 3.453 41.0°F 10823 2.599 71.6°F 5621 1.799
-18.4°F 47431 4.129 12.2°F 21345 3.405 42.8°F 10395 2.548 75.2°F 5225 1.716
-16.6°F 45146 4.093 14.0°F 20418 3.356 44.6°F 9986 2.498 77.0°F 5000 1.675
-14.8°F 42984 4.056 15.8°F 19537 3.307 46.4°F 9596 2.449 78.8°F 4861 1.636
-13.0°F 40938 4.018 17.6°F 18698 3.258 48.2°F 9223 2.399 80.6°F 4690 1.596
-11.2°F 39002 3.98 19.4°F 17901 3.208 50.0°F 8867 2.35 86.0°F 4218 1.483
-9.4°F 37169 3.94 21.2°F 17142 3.158 51.8°F 8526 2.301 87.8°F 4072 1.447
-7.6°F 35433 3.899 23.0°F 16419 3.107 53.6°F 8200 2.253 89.6°F 3933 1.412
-5.8°F 33788 3.858 24.8°F 15731 3.057 55.4°F 7888 2.205 91.4°F 3799 1.377
-4.0°F 32230 3.816 26.6°F 15076 3.006 57.2°F 7590 2.158 95.0°F 3547 1.309
-2.2°F 30752 3.773 28.4°F 14452 2.955 59.0°F 7305 2.111 96.8°F 3428 1.277
-0.4°F 29350 3.729
30.2°F 13857 2.904 60.8°F 7032 2.064 100.4°F 3204 1.213
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 it is 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.
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 sen-
sor reading. The sensor should read 3.7 volts
at the main board connector when the cube
temperature is 1 degree. After the fill, the sen-
sor will read water temp 1.5 to 2.2 volts.
Please note, some shattering is normal for
a flex tray icemaker.
Guide – Bin Full
Ice Maker Thermistor
Ice Maker Test Button
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 1.5Ԭfor 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 1.5Ԭfor 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.
2

Error Items LED TROUBLE TESTING
I/M-SENSOR (R on Twin
I/M units)
Ice Maker Sensor Error- open or short-circuit, connector failure. Cause is
also a tempe rature reading > 122°or < -58 ° F
The voltage at MAIN PCB
Sensor be tween 4 .5V~1.0V
R-SENSOR Refrigerator Room Se nsor Error- open or short-circuit, connector fail ure.
Cause is also a temperature reading > 122 °or < -58 ° F.
The voltage at MAIN PCB
Sensor be tween 4 .5V~1.0V
DE FRO ST SE NSOR OF
R ROOM
Ref. Defrost Sensor Error- open or short-circuit, connector failure. Cause is
also a tempe rature readin
g
> 122 °or < -58 ° F
The voltage at MAIN PCB
Sensor be tween 4 .5V~1.0V
R-FAN ERROR This erro r indicates the Refrige rator Evap Fan is no t spinning at the correct
RPM or the fan feedback lin e is open.
Fan voltage at MAIN PCB shall
be between 7V~12 V
I/M FUNCTION
ERROR(R on Twin I/M)
This erro r indicates the Ice tray has not returned to level after an ice
harvest. The error is displayed after three failed attempts. Repl ace I/M
COOL SELECT ZONE
SENSOR
Cool Select Zone Sensor Error- open or short-circui t, connector failu re.
Cause is also a temperature reading > 122 °or < -58 ° F
The voltage at MAIN PCB
Sensor be tween 4 .5V~1.0V
R-DEFROSTING
ERROR
Refrigerator Room de frost heater- open or short-circui t, conne ctor failure,
or defective temperature fuse/bi-metal. Defrost on over 80 minutes
Disconnect defro st connector
from PCB, check re sistan ce
PANTRY-DAMPER-
HE ATER ERROR
Sensor system in Pantry Room err ors Disconnect heater connector
from PCB, check re sistan ce
CR-SENSOR 4-Door CR Ro om S ensor E rror - This can b e an open or short-circui t, contact
failur e. Cau se i s also a temperature re adin g > 122°or < -58 ° F.
The voltage of MAIN PCB
Sensor be tween 4 .5V~1.0V
DEFROST SENSOR CR
ROOM 4-Door
CR Room De frost Sensor Err or- open or shor t-circuit, conne ctor failure.
Cause is also a temperature reading > 122 °or < -58 ° F.
The voltage at MAIN PCB
Sensor be tween 4 .5V~1.0V
DE FRO ST SE NSOR OF
CF ROOM 4-Door
CF Room De frost Sensor Err or- open or shor t-circu it, connector failu re.
Cause is also a temperature readin
g
> 122°or < -58 ° F.
The voltage at MAIN PCB
Sensor be tween 4 .5V~1.0V
CR-DEFROSTING
ERROR 4-Door
CR Compartment Defrosting heater- open or short-circuit, conne ctor
failure, or defective temperature fuse/bi-metal. Defrost on for over 80
minutes
Disconnect heater connector
from PCB, check re sistan ce
CF-DEFROSTING
ERROR 4-Door
CF Compartment defro sting heater- open or short-circuit, connector failur e,
or defective temperature fuse/bi-metal. Defrost on for over 80 minutes
Disconnect heater connector
from PCB, check re sistan ce
WATER TANK HEATER
ERROR Err or is d isplayed when the water re servoir tank hea ter i s open or shorted
Disconnect heater connector
from PCB, check re sistan ce
EXT-SENSOR Ambient Temp. Sensor Error- open or sh ort-circuit, connector failure.
Cause is also a temperature reading > 122 °or < -58 ° F
The voltage at MAIN PCB
Sensor be tween 4 .5V~1.0V
F-SENSOR Free zer Compartment Se nsor Err or- op en or shor t-cir cuit, connector
failur e. Cau se i s also a temperature re adin g > 122°or < -58 ° F
The voltage at MAIN PCB
Sensor be tween 4 .5V~1.0V
F-DEF-SENSOR Freezer Room Defrost Sensor Error- op en or shor t- cir cuit, connector
failur e. Cau se i s also a tempe rature re ading > 12 2°or < -58 ° F
The voltage at MAIN PCB
Sensor be tween 4 .5V~1.0V
F-FAN ERROR This erro r indicates the Freezer Evap. Fan is no t spin ning at the correct
RPM or the fan feedback lin e is open.
Fan voltage at MAIN PCB shall
be between 7V~12 V
C-FAN ERROR This erro r indicates the Condenser Fan is not spinni ng at the correct RPM
or the fan feedback li ne is open.
Fan voltage at MAIN PCB shall
be between 7V~12 V
CF-SENSOR 4-Door CF Room Sensor Error - open or sh ort-circuit, connector failure. Cause is
also a tempe rature reading > 122°or < -58 ° F
The voltage at MAIN PCB
Sensor be tween 4 .5V~1.0V
F-DEFROSTING
ERROR
Free zer defrosting heater- op en or shor t-circuit, connector failu re, or
defective temperature fuse/bi-metal . Defrost on for over 80 minutes
Disconnect defro st connector
from PCB, check re sistan ce
CF-FAN ERROR
4-Door
This erro r indicates the CF Comp artment Evap. Fan is not sp innin g at the
correct RPM or the fan feedback lin e is open.
Fan voltage at MAIN PCB shall
be between 7V~12 V
CR-FAN ERROR
4-Door
This erro r indicates the CR Compartment Evap. Fan is not spinnin g at the
correct RPM or the fan feedback lin e is open.
Fan voltage at MAIN PCB shall
be between 7V~12 V
ICE PIPE HE ATER
ERROR Err or is d isplayed when the ice maker fill pi pe heater i s open or shor ted. Repl ace Fill Tube Ass'y
Uart ERROR
COMMUNICATION
This erro r is not applicabl e, if the erro r is detected during d iagnostic testing
ple ase i
g
nore it. No Repair Necessary
L?M ERROR
COMMUNICATION Communication error within the Main PCB Repl ace main PCB
P?M ERROR
COMMUNICATION Communication between the Main PCB an d Keypad Check wiring in door & cabinet,
Panel PCB, Main PCB
Samsung 'Refriger ator ' Diagnostic Code Quick Guide
3

CN30 1-7 F Dr Sw (Blk-Gry) 2-7 CF Dr Sw (Brn-Gry) 3-7 F Sensor (Red-Gry) 3.5~4.2vdc 4-7 F Def Sensor (Org-Gry) 2.3~4.2vdc 5-7 CF Sensor (Yel-Gry) 2.7~4.05vdc 6-7 CF Def Sensor (Pnk-Gry) 2.3~4.2vdc 8-14 R Dr Sw (Prp-Gry) 9-14 CR Door Sw (Blu-Gry) 10-14 R Sensor (Wht-Gry) 2.4~2.8vdc 11-14 R Def Sensor (S/Blu-Gry) 2~4.2vdc
12-14 CR Sensor (W/Blk-Gry) 2.4~3.2vdc 13-14 CR Def Sensor (W/Red-Gry) 2~4.2vdc
CN74 1 C Fan FG (Red) 2 R Fan FG (Brn) 3 F Fan FG (Blk) 4-7 C Fan Mtr (S/Blu-Gry) 7~12vdc 5-7 R Fan Mtr (Org-Gry) 7~12vdc 6-7 F Fan Mtr (Yel-Gry) 7~12vdc 7 vdc GND (Gry) CN75 1 +12 VDC (Red)
2 Coil A (Blk) 3 Coil A Inverse (Yel) 4 Coil B (Org) 5 Coil B Inverse (Blu)
CN90 Ice Maker 1-2 I/M Motor (Red-Blk) 12vdc 3-4 I/M Sensor (Wht-Wht) 2.1~3.7vdc 5-8 Test Sw (Gry-Blu) 6-8 +5 VDC (Blu-S/Blu) 7 Hall IC Out (Prp) CN78 1 +5 VDC (Red) 3 VDC GND (Blk) 5 +12 VDC (Yel)
CN40 1-3 Cube Mtr Sw (Blk-Gry) 2 Home Bar Dr Sw (W/Red)
CN50 Display 4-6 +12 VDC (Org-Pnk) 5-6 +5 VDC (Yel-Pnk) 8-7 Ice sw (Prp-Blu) 9-7 Water sw (Wht-Blu) 6 vdc GND (Pnk)
CN76 1 & 11 +12 VDC (Blk-S/Blu) 1-2 CF Fan Mtr (Blk-Brn) 7~12vdc 3 CF Fan FG (Red) 1-4 Ice Pipe Heater (Blk-Org) 12vdc 11-5 CR Fan Mtr (S/Blu-Yel) 7~12vdc 6 CR Fan FG (Pnk) 11-10 H2O Tank Htr (S/Blu-Wht) 12vdc
CN73 120vac 1-(CN70-9) Cube Mtr (Yel–Red) 3-(CN70-9) Auger Mtr (Pnk–Red) 5-(CN70-9) Water Solenoid/Valve (W/Blk–Red) 7-(CN70-9) Ice Solenoid/Valve (Prp–Red)
CN72 120vac 1-(CN70-9) CR Room Lt (Wht-Red) 3-(CN70-9)CF Room Lt (Brn-Red) 5-(CN70-9) R Room Lt (Blu-Red) 7-(CN70-9) F Room Lt (Prp-Red) 13-(CN70-9) Compressor (S/Blu-Red) 15-CN70 Htr GNDs
CN71 120vac 3-1 Dispenser Htr (W/Blk-Gry) 5-7 Home Bar Htr (Blu-Gry)
CN70 120vac 1-(CN72-15) CR Def Htr (Blk-Org) 3-(CN72-15) CF Def Htr (Yel-Org) 5-(CN72-15) R Def & Drain Htr (Wht-Org) 7-(CN72-15) F Def & Drain Htr (Brn-Org)
Ext Sensor read 7-8 of F Hinge connector 1.2~2 vdc
RM255**
4

IceMaker
Water Filter
WaterTank
SMPS MainPCB
Pushupsharplytoloosen Swingbezelawayfromdoor
RM255****
5

ServiceAccess
DisassemblyofQuatro CoolEvaporatorCovers,bothaccessthesameway
6

Accessingthe Refrigerator Evaporators
Pullcoverupandoutfarenough
tounplugwireharnesses
Remembertolockinbottomfirst
whenreinstalling
WaterTankHeaterConnector
FreshFood
ConvertibleSection
FailureoftheDrainHoseHeater couldcausewaterbuildupon
fridgefloorandcoolingissues
7

Remove4screws
Snapoffcaps
AccessingFreezerEvaporator
SnapoffcoverUnplugwireharnesses
FailureoftheDefrostDrain HoseHeatercouldcauseice
builduponfreezerfloorand coolingissuesinFreezer
and/orArcticZone
8

RM255****
9