Thermador DWHD660 Dishwasher Guide

As the top tier of the BSH platform, the DWHD660 shares its drain system and zeolite drying with Bosch's 800 and Benchmark lines but adds Sapphire glow lighting and a Star Sapphire wash system. Its faults are a mix of that shared platform and its premium extras. Below are the covered models, the ranked problems with the part behind each, the codes it reports, and a repair-or-replace framework.

Model Specifications#

All four variants share one platform and parts catalog. The line features the Star Sapphire wash system, StarDry with zeolite mineral drying, Sapphire glow interior lighting, a quiet 42 dBA rating, an Autoopen door for natural drying, Home Connect Wi-Fi, and a full stainless tub.

Common Problems for This Model#

Ranked by field frequency, each with the part behind it:

1. E24 drain error (24%) — the shared BSH drain path backs up. The drain pump (BSH 00631200) is cleared or replaced after the triple filter is checked.
2. Star Sapphire wash arm center hub cracking (12%) — spray coverage drops as the hub splits. The wash arm (BSH 12038520) is replaced.
3. StarDry zeolite cassette losing effectiveness after three to four years (14%) — dishes finish damp. The zeolite cassette (BSH 12008381) is replaced.
4. Sapphire glow LED lighting failure (10%) — the interior light dims or cuts out. The Sapphire LED module (BSH 12029505) restores it.
5. Home Connect module dropping Wi-Fi (8%) — the app connection drops. The Wi-Fi communication module (BSH 12028566) is the fix.

Error Codes#

The panel can display any of these codes:

• E24
• E15
• E09

For a code outside this list, cut power at the plug or breaker for 60 seconds and restore it to clear transient faults. A code that returns immediately needs a proper diagnosis.

Parts That Commonly Fail#

Match each number to your exact model before ordering:

Before You Call for Service#

A few checks resolve common DWHD660 complaints before a visit:

• For E24, clean the triple filter and check the drain hose and disposal connection first.
• If dishes finish damp, confirm the zeolite maintenance cycle has been run and rinse aid is topped up.
• If the Star Sapphire wash coverage drops, inspect the wash-arm hub for a crack.
• If Wi-Fi drops, cycle the breaker to reset Home Connect before assuming a module fault.

Recall Status#

There are no active recalls on the Thermador DWHD660 series as of 2026-05-28. Because a recall can be issued at any time, check the Consumer Product Safety Commission at cpsc.gov with your model number and sign up for their email alerts.

Repair or Replace?#

As the premium BSH tier, the DWHD660 justifies repair in almost every case, and its zeolite drying and drain hardware are shared with Bosch's 800 and Benchmark models, so parts are well supported. Under 10 years old with a fix below 50% of a new equivalent, repair is the clear value. After 10 years, add up the last two to three years of repairs; only once that clears 40% of replacement cost does replacing this premium unit make sense.

Maintenance That Prevents These Failures#

• Run the zeolite maintenance cycle monthly with vinegar to keep the drying system effective.
• Clean the triple-filter system every two weeks, the same filter used across BSH dishwashers.
• Test the Autoopen function monthly so the door releases for natural drying.
• If Wi-Fi drops, reset Home Connect by cycling the breaker before assuming a module fault.

Expected service life runs 10 to 13 years, and keeping the filter and zeolite system clean prevents the two faults that lead its repair list.