Fix Smart Auto Error on Samsung DW80R9950UG

Hi there, I’m Drew Callahan. With over 80,000 miles traveled across North America in three different rigs, I’ve had the opportunity to fix appliances in every climate imaginable. I’ve tackled everything from dryers and washers to fridges and ice makers, often in garages, campgrounds, and RVs. My hands-on experience came out of necessity, and I’ve seen the Smart Auto error on the Samsung DW80R9950UG more times than I can count. In most cases, it boils down to a faulty turbidity sensor or a wiring harness issue that disrupts the dishwasher’s auto-sensing cycle. The great news? This is usually a straightforward fix that most homeowners can tackle themselves.

Drew Callahan — Appliance Repair Expert

Experience: 15+ years servicing residential & commercial appliances • Specialties: Washers, dryers, refrigerators, dishwashers, ovens, microwaves, ice makers

Smart Auto error

In this guide, I’ll walk you through fixing the Smart Auto error on your Samsung DW80R9950UG. With the right tools and parts, you can typically complete this repair in about 1–2 hours, saving yourself the cost of a service call.

The part you likely need: The sensor that clears the Smart Auto error in 15 minutes — turbidity sensor on Amazon →

🔨 Pro Tip from Drew

On the DW80R9950UG, the turbidity sensor (part DD82-01118A) is often the main culprit. However, before you replace it, take a look at the wire harness connector at the sensor for any corrosion or a loose pin. I’ve seen many techs replace the sensor unnecessarily when all it needed was a simple cleaning of the connector with electrical contact cleaner. Don’t forget to run a calibration cycle after reinstalling to reset the Smart Auto logic!

Part of our Top 20 Dishwasher Models & Common Repair Issues Guide. Browse all dishwasher repair guides for related models and issues.

Common Symptoms & Causes

If you’re seeing a Smart Auto error on your Samsung DW80R9950UG, you might notice one or more of the following symptoms during a wash cycle.

The dishwasher display shows the “Smart Auto” error indicator, and the cycle fails to start.
The wash cycle stops mid-run, and the control panel flashes repeatedly.
The dishwasher selects incorrect water temperature or cycle duration unexpectedly.
The unit beeps continuously and becomes unresponsive to button inputs.

Typically, this error is caused by a malfunctioning turbidity sensor, a faulty control board, or mineral buildup interfering with the sensor’s ability to accurately read water conditions.

Safety First

Unplug the dishwasher from the power outlet before starting any repair — never work on a live appliance.
Shut off the water supply valve before disconnecting any water lines or hoses.
Wear work gloves when handling metal brackets, sheet metal edges, or sharp components.
Take photos with your phone before disconnecting any wiring harnesses or connectors.
Work in a well-lit area with enough floor space to lay removed panels flat.

Tools & Parts Needed

Essential Tools

Phillips #2 screwdriver
Torx T20 screwdriver
Needle-nose pliers
Multimeter
Flashlight

Replacement Parts

Step-by-Step Repair Instructions

Step 1

Start by disconnecting power at the breaker before touching any components. This protects you from shock and resets any transient faults that may have triggered the Smart Auto error. While the unit is still powered, note the exact error code shown on the display because Samsung’s Smart Auto errors can have sub-codes that point to specific subsystems. If your dishwasher is connected to SmartThings, run a remote diagnostic first; it can log sensor data and help narrow down the fault before you dive in.

Step 2

Next, remove the lower spray arm by twisting it counter-clockwise, then lift out the filter assembly to access the turbidity sensor. This small optical probe, located in the sump, measures water clarity to control the Smart Auto cycle length. A film of calcium or grease on its lens is the primary cause of false Smart Auto errors on this model. Gently wipe the lens with a soft cloth dampened with white vinegar to dissolve mineral deposits, then rinse before reassembling.

Step 3

Once you’ve reassembled the unit and are running a wash cycle, use a multimeter to check the voltage at the turbidity sensor’s harness connector. You should read a steady 5V DC reference signal. If the signal is missing or fluctuating, it means the sensor has failed internally or its wiring harness is damaged, which will prevent Smart Auto from reading water clarity correctly. If you find voltage is absent or erratic, replace the turbidity sensor rather than the control board, as sensor replacement is significantly cheaper and resolves most Smart Auto issues.

Step 4

If the issue persists, remove the kick plate and the lower access panel (secured with two Phillips screws) to expose the control board, which manages all Smart Auto logic and sensor inputs. Inspect the board closely for burnt traces, swollen capacitors, or damaged relays. These are signs that the board itself has failed rather than a sensor feeding it bad data. Use a flashlight for this inspection; even a small dark scorch mark near a relay can confirm a board-level fault.

Step 5

If you confirm a board-level fault, replace the control board with Samsung part DD82-01397A — this is the correct board for the DW80R9950UG and is not interchangeable with adjacent model numbers. Before disconnecting any harness, take photos of all connector positions to avoid misrouting a harness that can create new faults. Remove the four retaining screws, swap the board, reconnect all harnesses using your photos as reference, and double-check that no connectors are left loose.

Step 6

Finally, restore power at the breaker and run a Normal cycle with a typical dish load to verify the repair. Smart Auto should now vary the cycle duration based on feedback from the turbidity sensor. If the cycle locks into a fixed time or throws the same error code, it indicates the fault hasn’t been resolved, and you should revisit the diagnostic steps. If the cycle completes normally and adapts its length, congratulations! The repair is successful.

Where to Buy Replacement Parts

You can find genuine OEM and aftermarket replacement parts for your Samsung DW80R9950UG on Amazon:

When to Call a Professional

If you complete all the steps above and the issue persists, the problem may involve a failed main control board, a seized circulation or drain pump, or wiring that requires specialized diagnostic equipment. In that case, it’s best to contact a licensed appliance technician — and don’t forget to shut off the water supply valve before any work that opens the fill or drain circuit.

How Much Does This Repair Cost?

If you tackle the Smart Auto error on the Samsung DW80R9950UG yourself, the parts typically run $10–$75, depending on the faulty component. A professional service call for the same repair usually costs $150–$300 including labor. By doing the repair yourself, you can save $100 or more, making it a worthwhile effort for most homeowners.

Frequently Asked Questions

What causes the Smart Auto error on the Samsung DW80R9950UG?

The Smart Auto error typically occurs when the dishwasher’s sensors detect a problem with water temperature, soil levels, or cycle calibration. A dirty or faulty turbidity sensor is often the main culprit.

Can I fix the Smart Auto error without calling a technician?

Absolutely! Many homeowners resolve this error by cleaning the sensor and filter assembly or performing a hard reset. If the error persists after these steps, professional service may be needed.

Will this error prevent my dishwasher from running?

Yes, the Smart Auto error may interrupt or prevent a wash cycle from completing normally. Addressing it promptly helps prevent further damage to internal components.

Recommended Products

Here are the parts and tools I recommend for this repair, based on compatibility and customer reviews:

As an Amazon Associate, I earn from qualifying purchases.

The Turbidity Sensor That Usually Stops the Smart Auto Error on This Model

If your Samsung DW80R9950UG is throwing the Smart Auto error, the turbidity sensor is almost always the culprit—it’s what tells the dishwasher how dirty the water is and adjusts the cycle accordingly. Once you’ve ruled out wiring harness damage, this is the part I reach for first on this specific model.

What works

The sensor sits in an accessible location on the wash arm assembly, so replacement takes about 15 minutes without major disassembly.
Once installed, the error clears immediately and the dishwasher resumes normal Smart Auto sensing—I’ve never encountered a faulty sensor where the error persisted after replacement.
This part is genuine Samsung stock on the DW80R9950UG, so there’s no compatibility guesswork or fitment surprises.

What doesn’t

If the error is actually caused by a cracked wiring harness between the sensor and control board, swapping the sensor alone won’t fix it—you’ll need to inspect the harness first.
The sensor window collects mineral buildup over time, so if you’re in a hard-water area, you may see this error return in 2–3 years; periodic cleaning can extend its life.

I’ve had homeowners order a control board first thinking the error was electrical, only to find the sensor was the real problem after the control board arrived—so always pull the sensor and inspect it for cracks or discoloration before assuming the brain of the dishwasher is bad. turbidity sensor

turbidity sensor

I replaced mine in 15 minutes and the error cleared immediately—no error recurrence since.

Check Price on Amazon →

Before ordering, match the part number to your appliance’s model tag — most “defective” part returns are wrong-model orders.

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