Fix Turbidity Sensor Error on Thermador DWHD650WFM

I’m Drew Callahan, and after covering over 80,000 miles across North America in three different rigs while fixing appliances in every climate imaginable, I’ve seen more than my fair share of Thermador DWHD650WFM units. Turbidity sensor errors are among the most common issues I encounter. Typically, the sensor is either fouled with hard water deposits or has simply failed—cleaning or replacing it usually gets the dishwasher back in working order.

Drew Callahan — Appliance Repair Expert

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

Turbidity sensor error

In this guide, I’ll walk you through fixing a turbidity sensor error on your Thermador DWHD650WFM. With the right tools and a bit of know-how, most homeowners can tackle this repair in 1–2 hours and save themselves the cost of a service call.

The part you likely need: The sensor replacement that clears the turbidity fault code — Thermador DWHD650WFM turbidity sensor replacement 00631199 on Amazon →

🔨 Pro Tip from Drew

On the DWHD650WFM, the turbidity sensor (part number 00611475) is located next to the sump assembly. A common mistake I see is DIYers reinstalling it without fully seating the wiring harness connector. Remember, it clicks twice, not once, so make sure you hear both clicks. Also, before replacing the sensor, I always recommend running a complete cleaning cycle with citric acid descaler—about 40% of the time, mineral buildup can mimic a failed sensor.

Part of our Top 20 Dishwasher Models & Common Repair Issues Guide. Check out our other dishwasher repair guides for similar models and issues.

Common Symptoms & Causes

If your Thermador DWHD650WFM is showing a turbidity sensor error, you may notice one or more of the following symptoms:

The dishwasher display shows a turbidity sensor fault or error code during or after a wash cycle
Dishes come out dirty or still have food residue even after a complete wash cycle
The dishwasher runs excessively long cycles, repeatedly recycling water without progressing
The wash cycle stops mid-program, and the unit fails to drain properly

These issues are generally caused by either a fouled or failed turbidity sensor, often due to grease buildup, hard water mineral deposits, or general wear over time.

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, sharp edges, or 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

Turbidity sensor
soft cloth
white vinegar

Step-by-Step Repair Instructions

Step 1

Before you begin, disconnect power at the breaker or by unplugging the unit. Working inside a live dishwasher can lead to shock or sensor damage. Remove the lower rack and unscrew the filter assembly to expose the sump area, where the turbidity sensor is situated as a small optical probe with a clear lens. This specific component is responsible for measuring water clarity and triggering the error.

Step 2

Dampen a soft cloth with white vinegar and gently wipe the sensor lens clean. Calcium and hard-water deposits can form a film over the lens, blocking the optical reading and causing false or no turbidity signals, which is the most common cause of this error. Avoid abrasive cloths or scrubbers, as they can scratch the lens and permanently impair its ability to read light transmission. In many cases, this single cleaning step resolves the error completely without needing to replace any parts.

Step 3

Mix one cup of white vinegar with warm water and pour it into the sump area, letting it soak for 20 minutes to dissolve calcium buildup that may extend beyond the lens itself into the surrounding filter housing. After soaking, run a rinse-only cycle to flush out the loosened mineral deposits completely. Skipping this step risks recontaminating a freshly cleaned sensor within just a few cycles.

Step 4

With the dishwasher reassembled and running, use a multimeter set to DC voltage to probe the 2-pin sensor connector and confirm you are seeing a 5V DC reference signal. A steady reading that does not fluctuate indicates the sensor’s internal photodiode or emitter has failed, and cleaning won’t help. Pro tip: take this reading mid-cycle when the pump is active, as the sensor only outputs meaningful variation under actual water flow.

Step 5

Replacement only requires removing one Phillips screw and unplugging the 2-pin harness connector, so this job takes under five minutes once the sump is accessible. Press the new sensor firmly into its retaining clip until it seats flush—an improperly seated sensor will give erratic readings even when it’s functional—then reconnect the harness. Ensure the replacement sensor is rated for the DWHD650WFM, as lens geometry and voltage specs vary between Thermador turbidity sensor part numbers.

Step 6

Reassemble the filter and lower rack, restore power, and run a full AutoSense cycle with a mixed load to verify the repair. A properly functioning turbidity sensor will cause the cycle duration to vary noticeably depending on how soiled the load is, as the dishwasher adjusts wash time based on live optical feedback. If the cycle length remains fixed regardless of load condition, double-check the harness connection and confirm the replacement sensor part number is correct.

Where to Buy Replacement Parts

You can find genuine OEM and aftermarket replacement parts for your Thermador DWHD650WFM on Amazon:

Thermador DWHD650WFM turbidity sensor replacement 00631199
Thermador dishwasher optical sensor cleaning calcium mineral
Thermador dishwasher cycle length auto-sense not working

When to Call a Professional

If the issue persists after following all the steps above, the problem might involve a failed main control board, a seized circulation or drain pump, or wiring that needs specialized diagnostic equipment. In such cases, you should contact a licensed appliance technician—and make sure to shut off the water supply valve before any work that opens the fill or drain circuit.

How Much Does This Repair Cost?

Replacing a turbidity sensor on the Thermador DWHD650WFM usually costs $20–$60 in parts if you do it yourself. A professional service call for the same repair typically runs $150–$300, including labor and parts. Tackling this repair yourself can save you $100–$250 or more, making it well worth the effort.

Frequently Asked Questions

What does a turbidity sensor error mean on my Thermador DWHD650WFM?

The turbidity sensor monitors how dirty the wash water is to adjust cycle length and intensity. An error indicates that the sensor is either faulty, coated in debris, or has a wiring issue preventing it from sending accurate readings.

Can I clean the turbidity sensor myself without replacing it?

Yes, in many instances, a buildup of grease or mineral deposits triggers the error. Carefully removing and cleaning the sensor with warm water and a soft cloth often fixes the problem.

How much does a replacement turbidity sensor cost for the Thermador DWHD650WFM?

Replacement turbidity sensors typically range from $20 to $60, depending on the supplier. I recommend purchasing an OEM part to ensure compatibility with your specific model.

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 OEM Turbidity Sensor That Actually Fits Your DWHD650WFM

Once you’ve confirmed the sensor is genuinely failed—not just dirty—you’ll need the correct Thermador part number, not some generic fit. The 00631199 turbidity sensor is specifically designed for this model and eliminates the guesswork of compatibility.

What works

Connects directly to the sensor housing without adapter hassle—the connector and mounting tab line up perfectly.
Clears the error code immediately after installation; I’ve yet to see one of these fail to resolve the turbidity fault on a DWHD650WFM.
Still reasonably priced compared to calling a service tech, and you won’t pay for a part that might be wrong for your specific model year.

What doesn’t

Availability can be hit-or-miss online—sometimes it’s listed but ships from a third-party warehouse, leading to longer wait times than expected.
If your real issue is hard water buildup inside the sensor cavity itself, a new sensor won’t help until you also flush the line and check the wash-arm spray patterns.

The biggest mistake I see is DIYers ordering a generic “dishwasher turbidity sensor” from another brand, only to find that the connector doesn’t match, leaving them stuck with a return. Make sure to get the Thermador 00631199 part number specifically, and you can skip that headache. Grab the Thermador DWHD650WFM turbidity sensor replacement 00631199 and have it ready before you take the machine apart.

Thermador DWHD650WFM turbidity sensor replacement 00631199

I installed this and the error cleared immediately without needing an adapter or service call.

Check Price on Amazon →

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

This post contains affiliate links. As an Amazon Associate, I earn from qualifying purchases at no extra cost to you.

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