How Thermador dishwasher error codes work
Thermador dishwashers display error codes on the digital control panel or through LED patterns on models without a display. These codes are stored in the control board memory and can be retrieved even after a power cycle. Understanding the code narrows down the diagnosis, but the code alone rarely tells the full story — it identifies the symptom, not always the root cause.
Drain and water codes
E24 — Drain blocked: The most common code. Clean the drain filter first — this solves 70% of E24 cases. Check the drain hose for kinks and verify the garbage disposal knockout plug was removed.
E25 — Pump impeller blocked: Debris physically stopping the pump. Remove the pump cover and clear obstructions.
E15 — Water in base pan: Flood protection triggered. Tilt the unit back 45° to drain the base pan. If E15 recurs, a seal or hose is leaking internally.
E04 — Fill timeout: Not enough water entering. Check the supply valve and hose. Clean the inlet valve filter screen.
E17 — Overfill: Too much water in the tub. Inlet valve may be stuck open.
Heating and sensor codes
E09 — Heater fault: Flow-through heater not reaching temperature. Element burnout, limescale, or relay failure.
E01 — Control board communication: Main board and display can’t communicate. Often a loose ribbon cable.
E22 — AquaSensor: Turbidity sensor reading incorrectly. Clean the sensor area; dishwasher functions but cycles may run longer.
When to call a technician
E15, E09, E01, and E17 always require professional service. E24 and E25 are worth attempting yourself (filter cleaning), but if they persist, the pump needs replacement.
Need professional Thermador Dishwasher service?
If troubleshooting doesn’t resolve the issue, our factory-certified Thermador technicians can help. We service all Thermador Dishwasher models across all 50 states with genuine OEM parts and a 30-day labor warranty. Schedule service online — same-day booking available.
Related Thermador resources
- Thermador Dishwasher repair service — certified technicians in all 50 states
- Thermador error code database — search all Dishwasher error codes
- Thermador model database — specifications and repair info by model number
- Thermador official site — official specifications, manuals, and product information
Important notes for Thermador dishwasher owners
- Always use genuine OEM parts — aftermarket components may fit but can compromise performance, safety, and warranty coverage on Thermador appliances
- Never ignore error codes — Thermador codes are diagnostic aids designed to prevent small issues from becoming major failures. Address them promptly
- Keep your owners manual accessible — it contains model-specific maintenance schedules and troubleshooting trees. Digital versions are available on the Thermador official site
- Document issues before calling — note error codes, symptoms, when they started, and patterns. This helps the technician diagnose faster
- Use surge protectors — power fluctuations damage electronic control boards. A quality surge protector protects your investment
When DIY troubleshooting is not enough
Some Thermador dishwasher issues can be resolved with the steps in this guide. However, call a certified technician immediately if you encounter:
- Gas smell (gas models) — turn off the appliance, open windows, leave the house, call from outside
- Burning smell or smoke — disconnect power immediately. Do not use until inspected
- Electrical sparking — turn off at the circuit breaker. Wiring or component failure
- Water leaking inside walls — shut off supply and call to prevent water damage
- Error codes that return after power reset — persistent codes indicate real component failure
- Sealed system issues — compressor, refrigerant work requires EPA-certified technicians
Schedule service online — our factory-certified Thermador technicians carry genuine OEM parts and serve all 50 states with a 30-day labor warranty.
