Troubleshooting The Samsung Washing Machine Error Codes

Causes:

• Incorrect connections at the water level sensor terminal
• Clogged air chamber.
• Leaky air-water level sensor hose
• Faulty water level sensor
• Damaged main PCB.

Solutions:

• Repair the sensor wire harness connection and replace it if necessary.
• Apply a hose clamp if air is leaking at the connection of the sensor hose.
  • Replace the sensor hose if there is a small leak (pinhole) in it.
• Remove and clean foreign material from the air chamber.
• Check the water level sensor frequency.
• Check the part code of the water level sensor, because if an incorrect part is used, an abnormal operation may occur. (Abnormal operation)
  • If the water level sensor is defective, replace it.
• Check the connector at the main PBA and/or sub-PCB.
• Check the DC voltage on the harness (voltage test points):
  • Main voltage: VCC and GND (between pin 2 and pin 3).
  • Output voltage: GND and OUT (between pin 1 and pin 2).
  • Frequency value: GND and OUT (between pin 1 and pin 2).

• Replace the sub-PCB if the voltages are missing or incorrect. (For models that have a water level sensor dc voltage supply from SUB-PCB)
• Replace the main PCB if the voltages are missing or incorrect.

Causes:

• Incorrect connections of the washing motor/hall sensor connector
• Faulty motor hall sensor
• Faulty motor rotor and/or stator.
• Faulty inverter PCB
• Faulty main PCB

Solutions:

• Check the motor assembly for any obstructions during normal rotation.
  • One possibility to consider is whether anything is obstructing the rotation of the drum, such as an object jammed between the outer tub and drum. If the drum is not rotating freely, it could be due to a blockage or damaged bearings.
• The resistance of the motor coil windings should be the same:

• Check the hall sensor resistance:

• From this point, also check the motor feedback signal. When rotating the drum by hand, you should notice a change in resistance.
• If okay, replace the main PCB.

Causes:

• Faulty harness connection
• Faulty inverter PCB
• Faulty main PCB

Solutions:

• Check the wire connection between the main PBA and the inverter PBA.
• Check the inverter PBA by flashing the LED; the inverter is normal when:
  • Unit power Off: LED is Off
  • Unit power on: 1 sec on, 1 Sec Off
• Check Main PBA by LED Blink; when it is normal
  • Unit power Off: 1 sec on, 5 Sec Off
  • Unit power on: 5 sec on, 1 Sec Off

Causes:

• Damaged harness connection.
• Faulty water supply valve
• Frozen water supply during the winter.
• Faulty pressure sensor hose
• Damaged main PCB.

Solutions:

• Check the water valves for physical damage.
• Look for any clogged valves.
  1. Water calcification can cause restrictions on water flow.
• A 4C error code can also be caused by a flood-safe water supply line previously installed:
  1. Flood-safe water hoses can sometimes shut off the water supply, even if there is no leak.
• Frozen valve during extreme cold weather conditions:
  1. During extreme cold weather conditions, valves can freeze, causing restrictions on water flow.
  2. Advise customers to have the unit installed at an appropriate location, or this can cause valves to crack and leak when temperatures rise and ice melts on the valve.
• Visually inspect the water valve harness for damaged or torn wire.
  1. Repair or replace the harness if it is damaged.
• On the Main PCB, locate the wire belonging to the valve you want to check and measure continuity
  1. Continuity is less than 2 Ω.
• Visually inspect every inch of the pressure sensor hose for any damage or small holes.
  1. The hose could have a very small hole and might be hard to notice unless you do a thorough inspection.
  2. Replace the pressure sensor hose if it is damaged.
• Check to make sure the terminal is properly connected to the water level sensor.

Causes:

• Reversed water supply.
• Temperature sensor.
• Main PCB fault.

Solutions:

• Check the hot water supply valve.
• Make sure the cold and hot water taps are properly connected (not reversed).
• Check the resistance of the water supply valve.

• Check if 120 VAC is being constantly supplied to the heater ASSY from the main PCB.
• Check the condition of the temperature sensor resistance:

Causes:

• Freezing in the winter season
• Foreign materials in the drain pump.
• Poor physical connection.
• Drain pump fault.
• Faulty main PCB

Solutions:

• Check for and remove any alien substances found inside the drain pump motor.
• Measure resistance at the drain pump: 13Ω to 16.5Ω.

• Replace the drain pump if it is shorted or opened.
• Enter into Manual Check Mode First:
  • Go to the step to check the Drain Pump
  • Check the 120 volts at the drain pump from the main PCB.

Causes:

• An error occurs when over- or under-voltage is supplied.
• Main PBA fault.

Solutions:

• Check Wire Harness Connections
• Check for an under-voltage or over-voltage condition at the AC outlet when the machine is running a cycle. (110 V to 130V AC)
• If the voltage is fine and a 9C error is displayed, replace the PBA.
• Check the noise filter.
• Check the power on the main PCB.
• Check Main PBA by flashing LED
• The main PBA is functioning normally when:
  • Unit power OFF: LED 1 sec on and 5 sec off.
  • Unit power ON: LED 5 seconds on and 1 second off.
• If the above does not meet your needs, replace the main PCB.

Causes:

• The signals between the main PBA and the sub-PCB are not sensed.
• AC/AE Error Displayed or Saved in Memory
• The unit stops at the beginning of the wash cycle.

Solutions:

• Check the wire connection between the main PBA and the sub-PBA.
• Check for disconnected or loose wires.
• Visually inspect the sub-PCB for moisture or water damage.
  • Spilled detergent on the control panel can potentially cause damage to the board, causing communication errors.
• Check the flashing LED on the main PCB.
• The main PBA is functioning normally if:
  • Unit power OFF: LED 1 sec on and 5 sec off.
  • Unit power ON: LED 5 seconds on and 1 second off.
• If the above does not meet your needs, replace the main PCB.
• If the unit still has an AC/AE error code, then replace Sub-PBA.

Causes:

• Door-Lock SW fault.
• Reed SW fault.
• Main PCB fault.

Solutions:

• Check power to the Door Switch
• Check the door switch lock power supply at 120 Vac at the main PCB.
• At the main PCB, check the door switch. Unlock the power supply at 120 VAC.
• Check and repair the power wire harness connections and insulation state.
• Check the door switch. Replace if faulty.
• Type 1: Check the door switch resistance.
• The resistance of:
  • Pin 1 and 3 Must be approximately 120Ω
  • Pin 1 and 2 are approximately 58Ω
  • Pin 2 and 3 are approximately 60Ω

Causes:

• Disconnection wire.
• Heater fault.
• Wash-thermistor fault.
• Faulty main PCB

Solutions:

• Check for connections between the main PCB, wire harness, and heater.
• Check Heater Resistance
• If the wash heater is faulty, replace it.
• Check the heater’s resistance.

• Check the 120 VAC power to the heater from the main and washing heater relays.
• A: Make sure to run a quick wash cycle first, selecting hot water, and checking the voltage on the heater after 5 to 10 minutes of the cycle running.
• B: Run the machine into manual service mode, make sure to fill up enough water, and then go check the heater function.
• Read Temp Sensor Resistance, approx. 13kΩ at room temperature.

Causes:

• Hose Disconnection.
• Damaged, disconnected water pressure sensor hose.
• The air hose is out of place, and water leakage occurs during the spin cycle.
• Water leakage occurs at the front with foaming because of too much detergent.

Solutions:

• Check for any leakage on the base, hose, valve, and tube connections.
• Check the temperature sensor and heater assembly for any leaks.
• DRAIN PUMP TYPE (Automatic Drainage)
  • Check whether there is any foreign material in the bellows. Note: Check for any foreign material, such as underwear wires or coins.
• Visually inspect every inch of the pressure sensor hose for any damage or small holes.
  • The hose could have a very small hole and might be hard to notice unless you do a thorough inspection.
  • Replace the pressure sensor hose if it is damaged.
• Verify that the pressure sensor hose is properly connected to the pressure sensor and to the washer tub.
• Check the water valve conditions.
• Visually inspect the drain hose for proper installation.
  • Make sure the drain hose is properly installed, preventing water from siphoning back into the washer.

Causes:

• Too much detergent
• The wrong detergent type is being used.

Solutions:

• Instruct the customer to use the proper amount of detergent as indicated by the detergent manufacturer.
• Use the detergent type indicated by the owner’s manual, HE (high efficiency).
• Having too many suds can cause problems by adding too much soap or using the wrong type of detergent.

Causes:

• Improperly loaded laundry (Do not fill more than 3/4 full)
• Uneven basket
• Defective damper

Solutions:

• Check how the consumer is loading the washer.
• Instruct the customer to pause, rebalance the load, or remove a few items and press start to resume the wash cycle.
• Make sure the unit is properly level and that the floor where the unit is installed is level and even.
• Inspect dampers for any physical abnormalities.
• UB occurs when the hall sensor reads abnormal spinning of the tub and does not indicate a defective hall sensor.
• Find the source causing the unit to be unbalanced.
• The laundry may be loaded incorrectly, and the unit may not be leveled due to an uneven floor or a broken or bent leg.

Causes:

• Water level sensor fault
• Freezing in the winter season
• Detergent Usage.
• The water valve stays open (leaks).

Solutions:

• Check If the water level sensor has a functional error, replace it.
• Check the hose.
• Can this error occur if it is torn, has a hole, or is folded?
• Can this error occur if water is frozen in the winter season?
• Consider relocating the unit to a warmer location.
• Check the hose connected to the water level sensor. Check whether the hose is folded, cut, or damaged.
• The customer uses too much normal detergent
  • It is filled with foam inside because the user uses too much normal detergent for top-load washers.
  • Explain the recommended amount of he-mark detergent for front-load washers to be used Use HE (high-efficiency) or low-suds detergent specially formulated for front-load washers.

Causes:

• Washing Temperature Sensor fault
• Main PCB fault.
• Freezing in the winter season
• Damaged Wire Harness

Solutions:

• Check the connections to the washing heater temperature sensor.
• If the washing heater temperature sensor has a functional error, replace it.
• First, check the thermistor type and the resistance of thermistor
  • The resistance of 2 pins must be approximately 10~15kΩ at 25°C/77°F.
  • Check for 5VDC on the sensor from the main PCB.

Causes:

• If the main PBA detects the wrong signal (input), an error message will be displayed.
• Micro controller Operation Fail Main PBA

Solutions:

• Power the washer off.
  • Wait 2–3 minutes.
    • Power the washer on, and then try again.
• If the fault code still occurs, replace the main PCB.

Causes:

• The button is continuously pressed for over 30 seconds.
• Defective sub-PCB or control panel.

Solutions:

• Check if the buttons are stuck.
  • Adjust the button or replace the control panel.
• Replace the sub-PCB (user interface).

Causes:

• Faulty MEMS sensor wire connection
• Faulty MEMS sensor

Solutions:

• Repair the MEMS sensor wire harness connector and replace it if necessary.
• Replace the MEMS sensor.

Solutions:

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