Thermador DWHD660 Dishwasher Guide

<strong>Quick answer:</strong> The Thermador DWHD660 Dishwasher Guide is a well-documented dishwasher with known repair patterns. Most common issue: StarDry zeolite cassette losing effectiveness after 3-4 year. This is the definitive resource for Thermador DWHD660 (Star Sapphire Dishwasher) dishwasher owners facing a breakdown. Inside you will find ranked failure data, error code explanations, OEM part numbers, <a href="https://www.cpsc.gov/Recalls" rel="nofollow noopener" target="_blank">recall</a> alerts, and straightforward guidance on whether to repair or replace at every stage of the unit's life.

Models Covered in This Guide#

This guide covers the Thermador DWHD660 (Star Sapphire Dishwasher) series dishwashers, manufactured from 2019-2026. The following model numbers share the same platform, parts catalog, and common failure modes:

• DWHD660WFP
• DWHD660WFM
• DWHD770WFP
• DWHD770CFP

All models listed above use the same core components and are serviced with the same replacement parts. If your specific model number starts with the same prefix but is not listed, this guide still applies — Thermador uses common platforms across model variants within a series.

Quick Specifications#

Top 5 Most Common Problems#

Based on repair data for Thermador DWHD660 (Star Sapphire Dishwasher) dishwashers, these are the most frequent issues ranked by how often we see them in service calls. Understanding these common failures helps you identify problems early and make informed repair decisions.

1. StarDry zeolite cassette losing effectiveness after 3-4 years (14% of repairs)#

StarDry zeolite cassette losing effectiveness after 3-4 years — dishes come out damp

Frequency: This issue accounts for approximately 14% of all service calls on the Thermador DWHD660 (Star Sapphire Dishwasher) series.

2. E24 drain error (24% of repairs)#

E24 drain error — shares BSH drain platform with all Bosch dishwashers

Frequency: This issue accounts for approximately 24% of all service calls on the Thermador DWHD660 (Star Sapphire Dishwasher) series.

3. Sapphire glow LED lighting failure (10% of repairs)#

Sapphire glow LED lighting failure — interior lights dim or cut out

Frequency: This issue accounts for approximately 10% of all service calls on the Thermador DWHD660 (Star Sapphire Dishwasher) series.

4. Star Sapphire wash arm center hub cracking (12% of repairs)#

Star Sapphire wash arm center hub cracking — reduced spray coverage

Frequency: This issue accounts for approximately 12% of all service calls on the Thermador DWHD660 (Star Sapphire Dishwasher) series.

5. Home Connect module dropping WiFi connection (8% of repairs)#

Home Connect module dropping WiFi connection

Frequency: This issue accounts for approximately 8% of all service calls on the Thermador DWHD660 (Star Sapphire Dishwasher) series.

Error Codes for Thermador DWHD660 (Star Sapphire Dishwasher)#

The Thermador DWHD660 (Star Sapphire Dishwasher) series may display the following error codes on its control panel or digital display. Error codes are your dishwasher's way of telling you what component has failed or what condition has been detected. Click any code below for a detailed diagnosis guide with step-by-step repair instructions:

• Error E24 — click for full diagnosis and fix
• Error E15 — click for full diagnosis and fix
• Error E09 — click for full diagnosis and fix

If your Thermador DWHD660 (Star Sapphire Dishwasher) is displaying an error code not listed above, try a power reset first: unplug the unit (or flip the circuit breaker) for 60 seconds, then restore power. Many transient errors clear with a simple reset. If the code returns, the underlying issue requires professional diagnosis.

Which Parts Commonly Fail?#

These are the parts most frequently replaced on Thermador DWHD660 (Star Sapphire Dishwasher) dishwashers. Part numbers are specific to this series — when ordering, always verify the part number against your exact model number, as there may be minor variations between production years.

Part costs vary by model and supplier. Professional installation adds additional labor cost depending on the complexity of the repair and your location.

Detailed Part Replacement Guides#

These guides cover the full replacement process including tools needed, step-by-step instructions, and what to test after installation:

• Bosch Dishwasher Drain Pump Replacement Guide

Recall Status#

There are no active recalls on the Thermador DWHD660 (Star Sapphire Dishwasher) series as of 2026-05-28. We recommend checking the Consumer Product Safety Commission at cpsc.gov periodically with your specific model number, as recalls can be issued at any time. You can also sign up for email alerts on the CPSC website to be notified if a recall is issued for your appliance.

Repair vs. Replace: When Is It Worth Fixing Your Thermador DWHD660 (Star Sapphire Dishwasher)?#

This is the most common question we hear from Thermador DWHD660 (Star Sapphire Dishwasher) owners. The answer depends on three factors: the age of the unit, the cost of the repair, and the cumulative repair history.

Thermador Star Sapphire dishwashers are the premium BSH tier. The zeolite drying system is shared with Bosch 800/Benchmark. All repairs are cost-justified.

General rule for the Thermador DWHD660 (Star Sapphire Dishwasher): If the unit is under 10 years old and the repair costs less than 50% of a new equivalent model, repair is almost always the better value. After 10 years, evaluate the total repair history — if cumulative repairs over the past 2-3 years exceed 40% of replacement cost, upgrading to a new unit provides better long-term value and a fresh warranty.

Repair Decision Matrix by Age#

| Unit Age | Minor Repair | Major Repair | Critical Repair | |---|---|---|<p>Our repair data reinforces this point — this is the definitive resource for thermador dwhd660 (star sapphire dishwasher) dishwasher owners facing a breakdown..</p>

---| | Under 5 years | Repair | Repair | Repair (usually) | | 5-10 years | Repair | Evaluate total history | Consider replacing | | Over 10 years | Repair if otherwise healthy | Consider replacing | Replace recommended |

Preventive Maintenance for Thermador DWHD660 (Star Sapphire Dishwasher)#

Regular maintenance is the most cost-effective way to extend the life of your Thermador DWHD660 (Star Sapphire Dishwasher) dishwasher and prevent the common failures listed above. Follow these practices:

1. Run the zeolite maintenance cycle monthly with vinegar
2. Clean the triple-filter system every 2 weeks — same filter as all BSH dishwashers
3. Test Autoopen function monthly
4. Reset Home Connect by cycling the breaker if WiFi drops

What Are the Best Long-Term Ownership Tips?#

To keep your dishwasher running efficiently, clean the filter assembly every 1-2 weeks, run an empty hot cycle with dishwasher cleaner or white vinegar monthly, and use rinse aid for better drying results. Load dishes so that nothing blocks the spray arm rotation — the spray arms must spin freely for proper cleaning. Scrape but do not pre-rinse dishes — modern dishwashers need some food residue for the soil sensor to determine the correct cycle intensity.

Need Professional Help With Your Thermador DWHD660 (Star Sapphire Dishwasher)?#

We've repaired thousands of Thermador DWHD660 (Star Sapphire Dishwasher) dishwashers across Sacramento and the Bay Area. Our technicians carry the most common Thermador replacement parts on every service call, which means most repairs are diagnosed and completed in a single visit — no waiting for parts to arrive.

Book your Thermador DWHD660 (Star Sapphire Dishwasher) repair today at /book — same-day and next-day appointments available. We provide upfront pricing before any work begins, and all repairs include a 90-day parts and labor warranty.