Samsung Dishwasher Error Codes

Causes:

• Auto-release mechanism.
• Harness
• Main PCB

Solutions:

• Access the top of the dishwasher and remove the connector to the auto-release mechanism.
• Measure the resistance of the wax motor of the auto-release mechanism.

• Confirm that the auto-release function is enabled in the setting mode.
• Press and hold the Delay Start and Sanitize keys simultaneously for at least 3 seconds.
• Press the Sanitize key until unit displays A1 or A0 is displayed. (A1: Auto Release Enabled; A0: Auto Release Disabled)
• Press Delayed Start to change to A1: Auto Release enabled.
• Check the continuity of the harness from the auto-release mechanism to the main PCB.
  1. Thermal actuator pin 1: continuity
  2. Thermal actuator pin 2: continuity
  3. Repair or replace the harness if there is no continuity through the wires.
• Place the unit in ‘Smart Install’ mode (manual mode), step 7: Auto Door Open Check.
• Measure the voltage coming from the main PCB at the auto-release mechanism terminals: approximately 120 VAC.
  1. Note: Replace the main PCB if 120 VAC is not supplied and items on steps 1 and 2 check out OK.

Causes:

• Faulty main PCB
• Faulty Inverter.
• Improper communication connection between the main PCB and inverter

Solutions:

• Check the connections between the main PCB connector and the inverter PCB connector.
• If the error is produced after verifying that communication cables are properly seated:
  1. Replace the inverter PCB.
• If an error is produced after the replacement of the inverter PCB:
  1. Replace the main PCB.

Causes:

• Kinked drain hose.
• Clogged drain filter.
• clogged drain pump.
• Defective main PCB.

Solutions:

• Verify that the drain hose is not kinked under the sink.
• Follow the drain hose path from under the sink to the dishwasher to make sure that the drain hose is not kinked.
• Remove the drain hose from its drain point and see if it is clogged.
• Take note if a new disposer was installed and the drain hose is connected to it.
• Verify if the drain hose is connected to the disposer.
• If the disposer knockout plug has not been removed, please remove it using a screwdriver.
• Remove any water from the inside of the sump from the previous cycle.
• Remove the drain pump from the sump by pressing the locking tab, then turn the drain pump upward to remove it.
• Once the drain pump has been removed, inspect for any foreign objects in the drain pump hosing.
• Reinstall the drain pump and test the drain operation.
• Set the dishwasher to drain test mode and check the output voltage of the main PCB to the drain pump at the main PCB.
• Inspect the Case Brake for any foreign objects stuck in the drain path.
• After completing all the previous steps, if the dishwasher does not drain, check if a particle made it past the drain pump and is stuck in the drain hose valve.
• If water enters the dishwasher with the power off, then replace the fill valve.

Causes:

• Faulty BLDC fan
• Damaged wire harness connection.
• Defective main PCB.

Solutions:

• Place the unit in ‘Smart Install’ mode, then go to step 5. The ‘Fan Check’ fan will operate for 30 seconds.
• Measure the voltage coming from the main PCB to the BLDC fan at the fan connector:
  • Voltage Test Points (VTP):
    • Main voltage: GND + VCC
    • Feedback voltage: GND + FG or PG

• Check the harness and connectors if the voltage is out of range.
  1. With the fan off, measure the voltage at the feedback.
• Check the continuity of each wire from the BLDC fan to the main PCB connector.
  1. Repair or replace the harness if it is damaged.

Causes:

• Faulty BLDC motor
• The high-pressure switch is faulty.
• If there are excess suds in the tub,
• If the microfilter is clogged,

Solutions:

• Check the connections for the BLDC motor.
  • Check if the filter is clogged.
• Check if the filter is clogged; remove debris from the filter and sump.

Causes:

• The supplied voltage is lower than 110 VAC.
• Damaged power cord.

Solutions:

• Measure the voltage coming into the filter.
• Check the output voltage of the filter; it should be the same as the input. If the output is abnormal, replace the filter.
• Check the frequency output of the filter; it should be 60 Hz.

Note: If the incoming voltage and frequency to the main PCB are normal, replace the main PCB.

Causes:

• Faulty Control Panel/Display Module
• Wiring harness.
• Faulty main PCB

Solutions:

• Wipe off any moisture from the control panel.
• Remove the control panel assembly and make sure the connector is properly seated at the sub-PCB.

Corrective Action

• “bC-2”: button is pressed for more than 30 seconds (shorted). Replace the control panel.
• “bC-3”: Communication between the Sub PBA and Touch Button Fails:
  1. Check Connections.
  2. Replace Control PBA.

Causes:

• Part defect and installation status
• Water leaked into the front side unit.
• The water leaks from the back side of the dishwasher, not from the base.

Solutions:

• Check the water supply hose’s tightness.
  1. Reassemble the water supply hose.
  2. If the water valve is damaged, please replace it with a new water valve.
• Check the level of the unit. Make sure it’s not tilted to the front, causing water to overflow.
  1. Adjust the level of the dishwasher.
• Check the assembly of the pump drain and hose.
  1. If any damage is found to the housing (sump), please change the sump.
• Check if the drain line is blocked, causing water to overflow.
  1. Remove the foreign substances and reassemble the parts.
• Check the assembly of the sump or seal the sump.
  1. Reassemble or replace the sump and the seal.
• Check the case brake for assembly and/or damage.
  1. Change the brake case.
• Check the damage to the seal-tub packing.
  1. Replace the seal tub packing.

Seal tub packing replacement procedure:

1. Remove the current seal tub packing.
2. Wet the new tub seal and fold it in half.
3. Pay attention to the direction of insertion.
4. The seal is inserted into the center of the dishwasher at the half-fold mark.
5. Press Seal to fit from the center to the left and right corners.
6. Press Seal from the top corner to the bottom corner.
7. Put the seal on the bottom left and right sides.
8. Pay attention to the end of the seal tub packing position. Refer to the line at the bottom of the tub.

End-of-sealed tub packing replacement procedure:

1. Check what type of detergent the customer uses; the hand dish detergent makes too much suds and cannot be used.
   • Customer Education.
2. Check the unassembled vane.
   • Make sure the assembly of the vane is correct.
3. Check the level of the unit.
   • Correct the level if necessary.

Water leaks from the back side.

1. Check if the drain hose is damaged.
   • Replace the drain hose.
2. Check if the tub seam is damaged.
   • If so, change the unit.

Causes:

• Faulty heater.
• Faulty wiring harness.

Solutions:

• Check connections at the heater and main PBA.
• Check the resistance between both ends of the heater.
• Activate the heater in service mode and check the voltage between the red wire of the heater relay and the black wire of the connector.

Causes:

• Faulty thermistor.

Solutions:

• Check the operation of the thermistor.
• Check that the voltage is not being supplied to the heater relay when the heater is not operational.
• Replace thermistor.
• Replace the main PCB.

Causes:

• Faulty distributor motor harness connection
• Faulty distributor motor microswitch
• Faulty distributor motor
• Faulty main PCB

Solutions:

• Check the connections for the distributor motor and micro switch connectors.
• Check whether the coil in the motor is conductive, approx. 3.6 ~ 4.0kΩ.
• Check the position sensing operations when turning the Micro Switch on and off. Check the conduction between the brown wire and the violet wire.
  • Micro switch on: Short
  • Micro switch Off: Open
• Note: The Micro Switch sign alternates between ON and OFF states. (Replace the micro switch if it is “ON “or “OFF “for 120 seconds.)
• Check and adjust the position of the cam assembly.
• Check whether half the load is operating normally. Half-load
  • operation (normal 120V).
  • Check the operation of the distributor motor relay.
  • Check the operating voltage (normal): 110 ~ 120 volts.
  • Replace the main PCB if the above are incorrect.
• Check the power relay.

Causes:

• Faulty water supply.
• Faulty water valve.
• Faulty main PBA

Solutions:

• Confirm that the water supply is on.
• Check whether any foreign material is in the water supply line or the water valve filter.
• Check the connection for the water valve connector.
• Remove the connector from the water valve and measure the resistance; the normal range is 890–1090Ω.
• Check that PBA is supplying AC voltage to the water valve; the normal range is 110–120 VAC.

Causes:

• Drain hose.
• Drain Pump.
• Main PBA.

Solutions:

• Check the drain hose, sump, and drain pump conditions.
• Check whether there is any foreign material.
• Remove the connector from the drain pump and measure the resistance; the normal range is 88Ω ±7%; set the dishwasher on drain test mode; and check the output voltage of the main PCB to the drain pump at the main PCB normal range of 120 VAC.
• Replace the main PCB if it is out of range.

Causes:

• Motor gear is out of order.
• The sensor vane is out of order.
• Blocked vane.

Solutions:

• Check the connections for the motor vane and sensor vane connectors.
• Check whether the coil in the motor vane is conductive.
• Check the resistance between the red and black wires (CCW):
  1. Normal range = 1.625 ~ 1.796k Ω.
• Check the resistance between the white and black wires (CW):
  1. Remove the connectors before measuring.
  2. Normal range = 1.625 ~ 1.796k Ω.
• Check the position sensing operations when moving the sensor vane on and off. (Use n5 Service test mode.)
• Check the conduction between the brown wire and the black wire.
  1. Sensor On: 0v
  2. Sensor Off: 5V
     • Faulty: Replace the sensor vane for sensing positions.
     • Normal: Replace the motor vane and sensor vane.
• Check whether the motor vane is operating normally.
• Check motor vane voltage while operating:
  • Normal range: 110-120 volts
• Check the operation of the motor vane relay.
• CCW: Check the operating voltage between the main PCB connector and the black wire of the main PCB connector.
• CW: Check the operating voltage between the main PCB connector and the black wire of the main PCB connector.
  • Normal: 110–120 volts (while operating)

Causes:

• Temperature sensor fault
• Faulty and incorrect connections of the dry condensing sensor
• Main PCB fault
• Freezing in the winter season

Solutions:

• Check the connections for the thermistor connector.
• Check whether the thermostat is operating normally.
  • Measure the voltage between both ends of the thermistor; the normal range is 0.05 to 4.95VDC
  • Measure the resistance between both ends of the thermometer; the normal range at 75 °F is 47.85 Kohm.

Causes:

• Communication failed between the sub-PCB and the main PCB.
• Faulty connectors.
• Faulty harness.

Solutions:

• Make sure the connectors on the sub-PCB and CN401 on the main PCB are properly seated.
  • Reseat and make sure connectors are locked in place.
  • Test the dishwasher after reseating the connectors.
• Check the continuity of all the communication wires from the sub-PCB to the main PCB, as shown in the diagram.