If you are seeing this code, you might notice the dishwasher stopping shortly after the cycle begins, or you may hear a clicking or grinding noise coming from the base of the unit. In some cases, the water might not reach the upper spray arm, or the heating element may fail to activate because the logic board cannot confirm water distribution. While this sounds technical, it is a very common mechanical issue. Don’t worry; with the right guidance and a bit of patience, this is a fixable problem that you can often handle yourself without a costly professional service call.
Repair Quick Specs
| Difficulty: | Intermediate (Requires disassembly) |
| Estimated Time: | 60 – 90 Minutes |
| Tools Needed: | Phillips Head Screwdriver, Digital Multimeter, Needle-nose Pliers, Large Towels |
| Estimated Cost: | $45.00 – $130.00 (Depending on model/part) |
Symptoms of a PE Error
When your Samsung dishwasher triggers the PE error, it rarely happens in isolation. You will likely observe several physical signs that point toward a diverter failure. First and foremost, the display panel will flash the “PE” code, and the machine will usually initiate its drain pump to clear any standing water before locking out the controls. This is a safety protocol to prevent the motor from burning out or the unit from overheating.
⚡ Pro Tip: Verify Technical Specs
For your safety and to avoid voiding the warranty, please check the official docs.
Another common symptom is unusual mechanical noises. You may hear a rhythmic clicking or a faint humming sound coming from the bottom of the tub during the start of the wash cycle. This is the diverter motor attempting—and failing—to rotate the internal disc. Furthermore, you might find that water is only reaching one spray arm (usually the bottom one). Because the diverter controls the flow between the top and bottom racks, a failure here means the water logic is broken. Finally, you may notice lukewarm water; the control board often inhibits the heater if it cannot confirm that water is circulating properly through the diverter assembly.
Technical Explanation of the Fault
Technical Explanation of the Fault
The “Half Load” system in a Samsung dishwasher relies on a small motor—the diverter motor—which rotates a plastic disc with specific holes in it. This disc directs water flow to the upper arm, lower arm, or both. The PE error occurs when the control board loses “eyesight” on this process. Here are the primary technical causes:
- Mechanical Diverter Motor Failure: Over years of use, the internal gears of the diverter motor can strip or the motor windings can burn out due to wear and tear. When the control board sends a 120V signal to move the motor and receives no feedback from the position sensor, the PE code is triggered.
- Micro-switch or Sensor Malfunction: Most Samsung diverters use a small micro-switch or a Hall Effect sensor to “tell” the board where the valve is. If voltage spikes have damaged this sensitive electronic component, or if moisture has leaked into the sensor housing, the signal becomes erratic or non-existent.
- Obstructed Diverter Disc: Sometimes the fault isn’t electrical but physical. Small pieces of broken glass, toothpicks, or heavy calcium scale can lodge in the diverter assembly. This creates mechanical resistance that prevents the motor from turning, eventually causing the motor to stall.
- Wiring Harness Corrosion: Because the diverter is located at the very bottom of the unit, even a tiny, slow leak from the sump seal can lead to corrosion on the wire connectors. This increased resistance interrupts the low-voltage communication between the sensor and the main PCB.
Troubleshooting & Replacement Instructions
Troubleshooting & Replacement Instructions
- Safety First & Power Down:
Before attempting any repair, you must disconnect the power. Unplug the dishwasher or flip the dedicated breaker in your electrical panel. Then, turn off the water supply valve usually located under the sink. WARNING: Never work on a dishwasher while it is connected to power, as the diverter area is near water sources and poses a high risk of electric shock. - Accessing the Internal Components:
Open the dishwasher door and remove the bottom rack. You will need to remove the unit from under the counter. Unscrew the mounting brackets at the top or sides. Slowly slide the unit out, ensuring the drain hose and water line have enough slack. Lay the dishwasher carefully on its back or side—place towels down first as some residual water will likely leak from the sump. - Removing the Bottom Access Pan:
Most modern Samsung models have a plastic base pan with a leak sensor attached. Use your Phillips head screwdriver to remove the screws holding this pan in place. Carefully disconnect the wires to the leak sensor so you can set the pan aside. You should now see the sump assembly, the drain pump, and the smaller diverter motor assembly (usually a small, boxy component with two or three wires). - Testing with a Multimeter:
Set your multimeter to the Ohms (Ω) setting. Disconnect the wire harness from the diverter motor. Place your probes on the motor terminals. A functional motor should show a resistance reading (usually between 1000 and 4000 ohms depending on the model). If the meter shows “OL” (Open Line) or 0, the motor coil is dead and must be replaced. Also, check the continuity of the micro-switch if your model has one. - Replacing the Diverter Motor:
If the motor is faulty, remove the mounting screws (typically two) that hold it to the sump. Pull the motor straight out. Be careful, as a small amount of water may drip from the shaft hole. Align the new motor shaft with the internal diverter disc. You may need to reach inside the tub and manually rotate the diverter disc so the “D-shaped” shaft of the new motor aligns perfectly. Screw the new motor into place and reconnect the wiring harness firmly. - Reassembly and Calibration:
Reattach the bottom pan and the leak sensor. Stand the unit upright and slide it back into the cabinetry. Reconnect the water and power. When you first turn it on, run a “Quick Wash” or “Rinse Only” cycle. The dishwasher may take a moment to “find” the home position of the new motor; once it does, the PE code should clear automatically.
How to Prevent Error PE
To ensure you don’t have to perform this repair again in the near future, follow these maintenance protocols:
1. Regular Filter and Sump Cleaning: The most common cause of diverter failure is debris. If food particles get past the filters, they can jam the diverter disc. Clean your fine-mesh filters every month and use a turkey baster to suck out any heavy sediment from the sump area. This reduces the mechanical strain on the motor.
2. Manage Hard Water Buildup: In areas with hard water, calcium deposits can “crust” over the diverter disc, making it difficult to turn. Use a high-quality dishwasher cleaner once a month to dissolve scale. This keeps the internal plastic components sliding smoothly against their seals.
3. Use a Surge Protector: Since the PE error can be caused by a fried position sensor on the motor assembly, protecting your appliance from “dirty power” is vital. A dedicated appliance surge protector can prevent voltage spikes from damaging the sensitive Hall Effect sensors within the motor housing.
FAQ
Frequently Asked Questions
Q: Can I just reset the dishwasher to clear the PE code?
A: While a power cycle (unplugging for 10 minutes) might temporarily clear the logic board’s memory, the PE code is a hardware-check error. If the board cannot verify the diverter position during its initial self-test, the code will return within the first few minutes of the next cycle. A physical inspection is almost always required.
Q: Is the PE error the same as an OE or 4E error?
A: No. While they all stop the machine, OE/4E refer to drainage and water supply issues respectively. PE specifically targets the distribution of water (the Half Load system). If you see PE, you can ignore the water inlet valve and focus entirely on the diverter motor assembly located at the bottom of the sump.
Q: How do I know if it’s the motor or the main control board?
A: It is statistically much more likely to be the motor (~90% of cases). You can verify this by checking for 120V AC at the motor wire harness during the start of a cycle. If the board is sending 120V but the motor isn’t moving, the motor is the culprit. If the board never sends voltage to the motor, only then should you suspect the main PCB.