Thermador DWHD Star Sapphire Dishwasher Guide

Which models this covers#

Built from 2018 to 2026, the DWHD Star Sapphire line shares one platform and parts catalog:

• DWHD660WFM
• DWHD760CFP
• DWHD770WFM
• DWHD870WFP
• DWHD660WFP

A same-prefix model not listed here uses the same tub, pump, and controls, so the guidance applies.

Specifications#

Common problems for this model#

1. E24 drain error — 26%. Identical to the Bosch platform: a clogged pump or kinked hose.
2. CrystalDry zeolite degradation — 14%. The drying mineral loses effectiveness, the same as the Bosch 800.
3. Star Speed cycle will not complete — 10%. A control-board timing error.
4. E15 leak sensor trips — 10%. From sump-gasket wear.
5. Sapphire interior LED lighting fails — 8%. The signature interior light goes dark.

It is a Bosch underneath — which is good news#

The single most useful fact about the Star Sapphire is that Thermador sits at the top of the BSH range but shares its interior with Bosch; the premium is in the finish, the sapphire lighting, and the Star Speed cycle, not the wash system. That means the E24 drain error and the CrystalDry zeolite wear behave exactly as they do on a Bosch 800, use the same parts, and follow the same fixes — so any Bosch dishwasher diagnosis applies here. The genuinely Thermador-specific faults are cosmetic or convenience items: the sapphire interior LED and the 20-minute Star Speed cycle, neither of which affects whether the machine cleans.

Error codes#

Each code links to a full walkthrough (shared with the Bosch platform):

• Error E24 — click for full diagnosis and fix
• Error E15 — click for full diagnosis and fix
• Error E09 — click for full diagnosis and fix
• Error E22 — click for full diagnosis and fix
• Error E01 — click for full diagnosis and fix
• Error E04 — click for full diagnosis and fix

For any code not listed, unplug the unit or flip the breaker for 60 seconds, then restore power.

Recall status#

There are no active recalls on the Thermador DWHD Star Sapphire series as of 2026-05-28. Check your model number at the Consumer Product Safety Commission — cpsc.gov — periodically, since recalls can appear at any time.

Repair or replace?#

As the top BSH tier, the Star Sapphire is worth repairing for nearly every fault. The usual line applies: under 10 years old and a fix under 50% of a new unit favors repair; past 10 years, weigh the cumulative history against 40% of replacement cost.

Maintenance#

1. Follow the Bosch 800 Series schedule — the internal platform is identical.
2. Clean the Sapphire LED modules with a damp cloth quarterly.
3. Use the Star Speed cycle for lightly soiled loads only; heavy loads will not clean in 20 minutes.
4. Descale the CrystalDry system with vinegar monthly, the same as Bosch.

Common questions#

What are the most common Star Sapphire faults? The E24 drain error at 26% and CrystalDry zeolite wear at 14% together are about 40% of calls, with Star Speed and E15 leak faults next.

Is it really the same as a Bosch dishwasher? Inside, yes — Thermador shares the Bosch platform, so the wash system, parts, and diagnostics match the Bosch 800 Series. The premium is the finish, sapphire lighting, and Star Speed cycle.

Should I use Star Speed for everything? No — the 20-minute cycle is for lightly soiled loads; heavily soiled dishes will not come fully clean in that time.

Book service#

We carry common Bosch and Thermador dishwasher parts on the truck, so most Star Sapphire repairs finish in one visit with an upfront quote. Book at /book before work begins.