Samsung Clothes Dryer Technical Information
Brand: Samsung
Models Covered: DV5471, DV5451
General Safety Information
CAUTION: All safety information must be followed as provided in the Service Manual of DV 5471, DV5451.
WARNING: To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.
Due to the possibility of personal injury or property damage, always contact an authorized technician for servicing or repair of this unit.
Refer to the Service Manual (DV5471, DV5451) for detailed installation, operating, testing, troubleshooting, and disassembly instructions.
Image showing two Samsung clothes dryers side-by-side: one stacked unit and one front-load unit.
Alignment and Adjustments
WARNING: To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.
Error Items and Diagnostic Codes
An occurrence of an Error will make a sound of error melody for 5 seconds and continuously show one of the Error Displays from the following errors.
| Error Display | Trigger | Action Taken |
|---|---|---|
| tE | The Termistor resistance is very low or high. | Check for: - Clogged lint screen. - Restricted vent system. - Check Thermistor resistance. |
| HE | Invalid heating Temp in running the dryer | Check for: - Restricted vent system. - Check Thermistor resistance. |
| dE | Running the dryer with door open | Check for: - Close the door, and run the dryer - Loose or open wire terminals in Door Sense circuit. |
| dF | Invalid door state for more than 256 milliseconds | Check for: - Loose or open wire terminals in Door Sense circuit. |
| bE2 | Invalid state of key circuit short for 30 secs | Check for: - Display PCB key circuit short or not |
| FE | Invalid power source Frequency | Check for: - Not using regular power source frequency - Invalid power frequency sense circuit |
| 2E | Electronic Control Problem (Over Voltage Error) | Check for: - Check PCB and Wire harness. - Check Power supply. |
| AE | Electronic Control Problem (Communication Error) | Check for: - Check PCB and Wire harness. - Replace PCB. |
| Et | Invalid state of Eeprom communication | Check for: - PCB with Eeprom circuit. |
Test Mode
Flowchart illustrating the transition to Test Mode: starting from Power On State (Normal User Mode), pressing Wrinkle Prevent + Dry Level for 7 seconds leads to Continuous Run Mode.
Continuous Run Mode:
- Press Wrinkle Prevent + Dry Level for 7 sec during Power On State (Normal User Mode).
- Once in Continuous Run Mode, display "CC" for 1 sec and the number of Cycle for 1 sec and the remaining time for 1 sec in turns.
- The previous cycle will restart during Continuous Run Mode until the mode is deactivated.
- During Continuous Run Mode, press Wrinkle Prevent + Dry Level for 7 seconds to return to normal user mode.
Service Mode
Definition: Dryer must be on before Service Mode can be entered. Upon entry into Service Mode, the Sensor Bar Touch Data will be shown (Default Service Mode).
How to Enter: To enter Service Mode, press Wrinkle Prevent and Temp Keys for 3 seconds, until it sends out a beeping sound. If pressing Wrinkle Prevent + Temp Keys for 3 seconds in Service mode, it will return Normal mode. Entering Service mode does not influence the operating cycle.
Sensor Bar Touch Data Mode
Definition: This action will put the dryer into sensor bar touch data mode. Dryer will display Sensor Bar data. This mode is the default mode of entering service mode.
How to Enter: With Power On, press Wrinkle Prevent and Temp Keys for 3 seconds.
Cycle Count Mode
Definition: This mode displays the total number of cycles that the user has carried out.
How to Enter: To enter cycle count mode, press the Wrinkle Prevent in Service Mode.
Software Version Mode
Definition: This mode retrieves the software version.
How to Enter: At Service Mode, press Temp until it sends out a beeping sound. Example: In case of "U0 05", U0 means major version, "05" means minor version. Pressing the Temp key in Software Version Mode returns to Service Mode.
Data Display Mode
Definition of Temperature Display Mode:
- Display Mode 0: Temperature data (Celsius)
- Display Mode 1: Average Touch Sensor data for 1 minute
- Display Mode 2: Average Temperature (Celsius) data for 1 minute
How to Enter: With Power On, press AdjustUp Key + AdjustDown Key for 7 seconds until a beeping sound is heard. If no keys are pressed for 5 minutes, it will revert from Data Display Mode. Pressing AdjustUp Key in this mode increases the Display Mode ID. Pressing AdjustDown Key decreases the Display Mode ID.
Converting °C → °F
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| -30 | -22 |
| -10 | 14 |
| 10 | 50 |
| 30 | 86 |
| 50 | 122 |
| 70 | 158 |
Formula: F = 9/5C + 32
System Check Mode
Flowchart illustrating the transition to System Check Mode: starting from Power Off State (Normal User Mode), pressing Dry Level + Power keys simultaneously leads to System Check Mode.
Definition: "t2" will display. System Check Mode (t2 mode) Progress: Function Performed: Start/Pause → Motor(CW) Relay On → Heater Relay On → Heater Relay Off, Motor(CW) Relay Off.
How to Enter: While in Power Off, pressing the Dry Level + Power keys simultaneously will put the dryer into the System Check mode.
Trouble Diagnosis
As the micom dry machine is configured with a complicated structure, service calls may occur. The following information is prepared for exact trouble diagnosis and suitable repair guidance.
Caution for the Repair and Replacement
Please follow below instructions for trouble diagnosis and parts replacement:
- As some electronic components can be damaged by charged static electricity from the dryer's resin part or the human body, prepare for human body earthing or remove the potential difference between the human body and dryer by contacting the power supply plug when working on the PCB.
- As the P.C.B assembly is designed for no trouble, do not replace the P.C.B assembly based on wrong diagnosis. Follow the procedure of the trouble diagnosis when the micom is not operated normally.
Illustration showing a hand holding a screwdriver to a power supply plug, with a wire connecting to the plug's ground pin, indicating how to discharge static electricity from the human body before touching electronic components.
Trouble Shooting
WARNING: To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.
General Troubleshooting
| No | Problem | What To Do |
|---|---|---|
| 1 | Will Not Start or Run |
|
| 2 | Motor runs/tumbler will not turn |
|
| 3 | Runs a few minutes and then stops |
|
| 4 | Blows fuses or trips circuit breaker |
|
| 5 | Blows fuses or trips circuit breaker (Gas Model) |
|
| 6 | Will not heat (motor runs) |
|
| 7 | Will Not Dry Gas Model Poor Gas Ignition | When the dryer is operated on a heat setting, the igniter should be energized and burner shall fire within 45 seconds at 120 VAC. The failure of a component in this system will usually be indicated by one of three symptoms: |
Gas Model Specific Troubleshooting
| No | Problem | What To Do |
|---|---|---|
| 8 | The igniter does not glow | If the igniter does not heat up, remove power and using an ohmmeter, check the following:
|
| 9 | Igniter glows - No gas ignition | If the igniter heats up but the main burner flame is not ignited, remove power and using an ohmmeter, check the following:
|
| 10 | The gas is ignited but the flame goes out | If a normal ignition takes place and after a short while the flame goes out, check for the following:
|
| 11 | Improper drying, clothes wrinkled, Rough texture, long dry time |
|
| 12 | Noisy and/Or Vibration |
|
Component Testing Procedures
Component Electrical Testing (with ohmmeter)
- Thermistor resistance: 10K Ω @ 25°C (77°F)
- Thermostat 1 resistance: < 1Ω
- Belt Cut-off S/W: Lever open: Resistance value < 1Ω; Lever push: Resistance value: ∞ Ω
- Thermostat 3 resistance: < 1Ω. If resistance is infinity, replace thermostat 3.
- Thermostat 2 resistance: < 1Ω. If resistance is infinity, replace thermostat 2.
- Heater resistance: 10 Ω. If resistance is infinity, replace Heater.
THERMISTOR
THERMOSTAT 1 (85°C, 25A, Thermal Cut-Off)
THERMOSTAT 3
THERMOSTAT 2
HEATER
BELT CUT-OFF S/W (125V, 15A)
LAMP (resistance 80~100 Ω (Blue & White))
Door Switch Measurement:
- Door switch open: Terminal "COM” - "NC" (1-3) : <1Ω; Terminal "COM” - "NO" (1-2) : ∞ Ω
- Door switch push: On: Terminal "COM” - "NC" (1-3) : ∞ Ω; Terminal "COM” - "NO" (1-2) < 1Ω
Motor (Electronic & GAS) Contacts
| Function | 1M | 2M | 3M | 5M | 6M |
|---|---|---|---|---|---|
| Start | |||||
| Run |
Symbol: • = Contact closed
Centrifugal Switch (Motor)
2.88Ω between Pin# 3 and 4
3.5Ω between Pin# 4 and 5
Diagram showing the internal connections of a centrifugal switch in the start position.
Gas Model Components
- Radiant Sensor (10RS): Resistance value < 1 Ω. If resistance is infinite, replace Radiant sensor.
- Gas Valve (25M01A): Valve 1-2: Resistance value 1.2KΩ; Valve 1-3: Resistance value 0.5KΩ; Valve 4-5: Resistance value 1.2KΩ. If resistance is infinity, replace Valve.
- Igniter (101D): Resistance value 40~400 Ω. If resistance is infinite, replace Igniter.
- Thermostat (60T21 Hi-Limit) 230F-50F: Resistance value < 1 Ω. If resistance is infinity, replace Thermostat.
Image of a Radiant Sensor.
Image of a Gas Valve.
Image of an Igniter.
Image of a Thermostat.
Sensor Bars & Temperature Sensor Check
- Sensor Bars: Disconnect harness and test Pink wire Pin 4 to Orange wire Pin 5. Approx ∞ Ω without laundry. Approx 1900 ± 10% with wet clothes.
- Cycling Thermostat: Disconnect harness and test Blue wire Pin 3 to Red wire Pin 6. Approx 10 KΩ at 25 °C/77 °F.
Image showing sensor bar connections with labeled wires (Pink wire Pin 4, Orange wire Pin 5) and cycling thermostat connections (Blue wire Pin 3, Red wire Pin 6).
Wiring System Connections
3-WIRE system connections
Components: A. External ground connector, B. Neutral grounding wire (green/yellow), C. Center silver-colored terminal block screw, D. Neutral wire (white or center wire), E. 3/4" (1.9 cm) UL-listed strain relief.
- Loosen or remove the center terminal block screw.
- Connect the neutral wire (white or center wire) of the power cord to the center, silver-colored terminal screw of the terminal block. Tighten screw.
- Connect the other wires to outer terminal block screws. Tighten screws.
- Tighten the strain relief screws.
- Insert the tab of the terminal block cover into your Dryer's rear panel slot. Secure the cover with a hold-down screw.
If converting from a 4-wire electrical system to a 3-wire, the ground strap must be reconnected to the terminal block support to ground the Dryer frame to the neutral conductor.
Diagram illustrating 3-wire system connections, showing external ground connector (A), neutral grounding wire (B), center terminal block screw (C), neutral wire (D), and strain relief (E).
4-WIRE system connections
Components: A. External ground connector, B. Green or bare copper wire of power cord, C. 3/4" (1.9 cm) UL-listed strain relief, D. Center silver-colored terminal block screw, E. Neutral Grounding wire (green/yellow), F. Neutral wire (white or center wire).
- Remove the External ground connector screw.
- Connect the ground wire (green or unwrapped) of the power cord to the external ground connector screw. If you want to connect B (Green or bare copper wire of power cord) to the Neutral Post without assembling with A (cabinet ground), call the service technician.
- Loosen or remove the center terminal block screw.
- Connect the neutral wire (white or center wire) of the power cord and the appliance ground wire (green with yellow stripes) under the central screw of the terminal block.
- Connect the other wires to the outer terminal block screws. Tighten screws.
- Tighten the strain relief screws.
- Insert the tab of the terminal block cover into your Dryer's rear panel slot. Secure the cover with a hold-down screw.
Diagram illustrating 4-wire system connections, showing external ground connector (A), green/bare copper ground wire (B), strain relief (C), center terminal block screw (D), neutral grounding wire (E), and neutral wire (F).
Wiring Diagrams
WARNING: To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.
Electric Dryer Wiring Diagram
Wiring diagram for an Electric Dryer, detailing connections from the Main PCB to components like Moisture Sensor, Thermistor, Heater, Hi-Limit, Cut Off, Motor, Water Valve, and Sub Display, along with power cord connections for 3-wire and 4-wire systems and Door Switch, Centrifugal S/W.
Gas Dryer Wiring Diagram
Wiring diagram for a Gas Dryer, detailing connections from the Main PCB Control to components like Radiant Ignitor, Motor, Gas Valve, Booster, Holding Coil, and Sub Display, along with power cord connections for AC120V/60Hz and Door Switch, Centrifugal S/W.
