Samsung Dishwasher 3C Error Code: Motor Communication Fault

Quick Answer

Samsung 3C error code means the main control board cannot communicate with the motor control board DD92-00134A. Before replacing any boards, check the wiring harness between the two boards - a loose or corroded connector is a common and cheap cause. 3C is distinct from LE, which means the motor physically locked.

When I run into a 3C code, the dishwasher's gone completely silent because the main brain can't talk to the motor controller. It's a digital handshake failure, not a mechanical jam. Vibration from the wash pump wiggles those tiny communication pins loose over time, and I'd say 40% of the time a simple harness reseat fixes the whole thing. Check that connector before you even think about ordering a board.

SamsungDishwasherSeverity: highDifficulty: advanced65% DIY Success

Time to Fix

60–120 min

Difficulty

advanced

Parts Cost

$80 – $150

Tools Needed

Phillips #2 screwdriver, Torx T20 screwdriver

What Does the 3C Code Mean?

Samsung splits the motor control off onto its own sub-board, and the 3C code fires when that link goes dead. You'll usually see it right at the start of a cycle when the machine tries to kick over the main pump. If you hear one quiet click and then nothing, that's your motor controller or the wiring to it. Pretty common on the 2017-2021 models and honestly not a disaster to fix.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Wiring harness connector between boards loose or corroded40%

Motor control board DD92-00134A failed24%

Damaged wire in harness from chafing or heat22%

Main control board failed (less common)14%

Symptoms You May Notice

3C code flashes at the very start of the cycle before any water even enters the tub.
Machine powers on fine, you pick your cycle, hit start, and then nothing. No hum, no pump noise, just silence and that error code staring at you.
You might catch one quiet click from the main relay trying to fire the motor, and then the display just sits there frozen.
Sometimes this shows up right after an LE error from a week or two ago, meaning the motor was already struggling before the communication link finally gave out.
Cycle won't progress past the initial start state on some models, or exits immediately to the error without even attempting to fill.

Can you reset a Samsung dishwasher to clear the 3C code?

To clear the display, press and hold the Start or Sanitize button for three seconds until the timer resets. While this clears the code, it rarely fixes the underlying communication drop. If the 3C returns within the first two minutes of a new cycle, you definitely have a hardware issue involving the DD92-00134A board or the wiring harness.

Tools Required for Diagnosis

Phillips #2 screwdriverTorx T20 screwdriverMultimeterContact cleaner sprayFlashlight or headlamp

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Motor Control BoardDD92-00134A · $80–$150	DD92-00134A	$80 – $150

Frequently Asked Questions

What's the difference between 3C and LE on Samsung dishwashers?

LE means the motor is physically locked, like something jammed the impeller. 3C means the boards can't talk to each other at all. Think of it this way: LE is a muscle problem, 3C is a phone line problem. Sometimes a bad LE situation can overheat the motor controller enough to cause a 3C later, so if you had LE codes before this showed up, check the impeller area for debris before you start swapping boards. Could save you $100.

Is it worth fixing a 3C error on an older Samsung dishwasher?

If the machine's under 6 years old, yeah, go for it. The DD92-00134A board is around $80-120 and it's a pretty straightforward swap. But if you're looking at a 10-year-old unit where the racks are rusting and the door seal's cracking, spending $150+ on parts and labor doesn't make sense. I usually tell people: if the repair costs more than 40-50% of what a comparable new unit costs, just buy new. Do the math first.

Can I run my Samsung dishwasher while it's showing a 3C code?

No. The machine won't run at all with a 3C active. It's not like some codes where the appliance limps through a cycle anyway. The motor literally won't start because the main board can't confirm the motor controller is online. You'll hit start and it'll either just sit there or immediately throw the error again. You need to fix this before the machine does anything.

How do I know if it's the motor board or the main board that failed?

Start with the motor control board DD92-00134A because it's the more common failure point and it's cheaper. If you swap it and the 3C comes right back within the first minute of a test cycle, that's your sign the main board's communication relay is shot. Main boards run $150-250 on Samsung dishwashers, so you really want to rule out the cheaper fix first. And honestly, check that harness connector before buying either one.

How long does swapping the DD92-00134A motor control board actually take?

Once you've got the kick plate off and you know where the board is, the swap itself takes maybe 20-30 minutes. The board slides out of a housing, you disconnect two or three connectors, new one goes right back in. No soldering, no special tools beyond a Phillips #2 and a T20. The hardest part is just getting down on the floor with enough light to see what you're doing. I usually use a headlamp so both hands are free.

Related Samsung Dishwasher Error Codes

Code: LESamsung Dishwasher LE Error Code: Motor Locked

Same Fix Works on These Brands

Samsung shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

Samsung washerSamsung Washer 3C2 Error Code: Motor Stall Samsung washerSamsung Washer 3E Error Code: Motor Fault Samsung washerSamsung Washer 4E Error Code: Water Supply Fault (Top Load)Samsung washerSamsung Washer 5C Error Code: Drain Error (Older Display)Samsung washerSamsung Washer 8C Error Code: Vibration Sensor Fault Samsung washerSamsung Washer 8E Error Code: Motor Frequency Sensor Fault

Models Known to Experience 3C Errors

This repair applies to most Samsung dishwashers with this error code. Common model numbers include:

DW80R9950US, DW80R2031US, DW80T5040US, DW80K5050US, DW80N6070US, DW80M9550US

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 14, 2026