David Carter Key Takeaways
- Drain pump replacement is the most common Thermador dishwasher repair and resolves E23 and E25 drain fault codes.
- Water inlet valve failures cause fill problems and are relatively inexpensive to replace.
- The Sapphire triple-filtration system reduces pump wear, but the filter must be cleaned regularly to maintain that benefit.
- Star-Sapphire models feature the StarDry drying system — condensation drying technology that has its own service path separate from heating element issues.
- Control board faults are the most expensive common repair but are uncommon on Sapphire series within the first ten years.
The Bottom Line
Thermador Sapphire and Star-Sapphire dishwasher repair cost ranges from $120 for a water inlet valve to from $380 for a control board. Given that these dishwashers retail from $1,500 to over $2,500, repair is the economically correct choice for virtually every component failure.
Thermador Dishwasher Repair Cost for Sapphire and Star-Sapphire Models
Thermador dishwasher repair cost is driven by two factors: the high-precision components used in Sapphire and Star-Sapphire dishwashers, and the labor required to access internal assemblies behind the door lining and tub base. These dishwashers are engineered for 15–20 years of daily use, so most owners are well-served by repairing rather than replacing when a component fails.
Repair Cost by Component
| Repair Type | Typical Cost | Related Code | Notes |
|---|---|---|---|
| Water inlet valve | from $120 | E22 | Controls fill water entry |
| Drain pump motor | from $185 | E23 | Most common internal repair |
| Drain pump impeller service | from $145 | E25 | Foreign object removal + inspection |
| Circulation pump motor | from $220 | None | Drives wash arm spray performance |
| Door latch assembly | from $130 | None | Cycle won't start if latch fails |
| Main control board | from $380 | Multiple | Uncommon on newer Sapphire models |
Star-Sapphire: Additional Service Considerations
The Star-Sapphire dishwasher adds the StarDry condensation drying system, which eliminates the need for a traditional heating element by using the stainless steel tub's thermal properties. If your Star-Sapphire dishes are coming out wet, the issue is rarely a failed component — more often it is incorrect loading, the wrong cycle selection, or rinse aid depletion. However, if the issue persists with correct loading and fresh rinse aid, the zeolite drying module (on select models) or the vent fan may need service.
Repair vs. Replace on Thermador Dishwashers
Thermador Sapphire dishwashers retail from $1,500, with Star-Sapphire models starting from $2,000. The most expensive common repair — a control board at from $380 — represents less than 20% of replacement cost. Even on a ten-year-old unit, repair is almost always the right financial decision unless multiple major components fail simultaneously. Our Thermador dishwasher repair service provides same-visit diagnosis and a written estimate before any parts are ordered.
Thermador Dishwasher Installation Costs: What Affects Them
If the repair involves disconnecting and reinstalling the dishwasher — for example, to access the pump assembly or replace the water inlet valve — the labor estimate will include time for removal and reinstallation. Sapphire and Star-Sapphire dishwashers are panel-ready units integrated flush with cabinetry, which means the technician must remove the custom door panel before the dishwasher can slide out. This adds fifteen to thirty minutes of labor compared to a standard stainless steel model. Factor this into the cost comparison when evaluating whether a repair is worthwhile.
Keeping Sapphire Repair Costs Low
The Thermador Sapphire triple-filter system requires cleaning every one to two weeks under heavy use. A clogged filter that is not addressed will eventually cause the drain pump motor to work against back-pressure, shortening its service life and leading to an E23 pump failure that costs from $185 to repair. Monthly filter cleaning takes less than two minutes and is the single most effective way to extend the life of the drain pump. Similarly, using Thermador-approved rinse aid — rather than a generic substitute — ensures the StarDry drying system performs correctly on Star-Sapphire models and reduces the need for service calls related to poor drying performance.