Step-by-Step DIY Fix Guide
- SAFETY: Switch off and disconnect power before inspecting the dishwasher.
- Turn off dishwasher. Remove bottom rack.
- Remove cylindrical filter (counter-clockwise) and flat mesh filter.
- Rinse under warm water. Scrub with soft brush.
- Reinstall (flat mesh first, then cylindrical). Run a cycle to test.
If the warning comes back after restart
- If the door closes normally but the warning keeps returning, the latch or switch path becomes more likely than a simple alignment issue.
- If airflow still seems weak after the basic checks, the fan path or a deeper obstruction becomes more likely.
- If the warning returns immediately after a clean restart, the sensor or wiring path becomes more likely than a one-time glitch.
What This Error Means
Error code E9240 on your Thermador dishwasher indicates: The dishwasher filter is blocked. The filter is the area where food particles get caught and it needs to be cleaned regularly. The appliance detects this condition through its built-in sensors and halts the current cycle to prevent further damage. Depending on the model, the code may flash on the display panel, appear on a digital readout, or cause the status lights to blink in a specific sequence. The dishwasher will not resume normal operation until the underlying fault is resolved.
The most frequent cause of error E9240 is same as e22 — clogged filter on premium models. When this happens, the dishwasher's control board detects the abnormal sensor reading or motor response and triggers the fault code as a protective measure. Other contributing factors are listed in the causes section below — working through them in order is the fastest path to a fix.
Error E9240 is one of the most DIY-friendly Thermador dishwasher fault codes. Most homeowners can clear it in under 15 minutes without tools or replacement parts. Follow the step-by-step guide below exactly — skipping steps is the most common reason the error comes back.
The most visible symptom of E9240 is standing water at the bottom of the tub at the end of a cycle — the dishwasher failed to pump it out. The water may appear cloudy from food particles or detergent residue. Do not run another cycle until the fault is cleared, as this could allow water to overflow onto the floor.
Most Likely Cause by Symptom
The Thermador dishwasher may stop, pause, or refuse to complete the cycle normally.
Likely cause: Same as E22 — clogged filter on premium models
Check first: SAFETY: Switch off and disconnect power before inspecting the dishwasher.
Performance may drop because airflow, filtering, or draining is restricted.
Likely cause: Same as E22 — clogged filter on premium models
Check first: Turn off dishwasher. Remove bottom rack.
The warning may return immediately because the appliance is detecting an internal fault.
Likely cause: Same as E22 — clogged filter on premium models
Check first: Remove cylindrical filter (counter-clockwise) and flat mesh filter.
Common Causes
- Same as E22 — clogged filter on premium models
What Not to Do
- Do not run further cycles until the fault is resolved
Model and Display Variation Notes
Model-family notes
- Thermador dishwasher display wording and code formats can vary by series.
- If your model behaves differently, check the owner manual before trying any deeper maintenance step.
Display and panel differences
- Panel wording can vary by series, so confirm the exact code pattern before buying parts.
Parts, Tools and Service Options
Common parts
- Replacement filter assembly ($20–$45)
Manual and model check
Check your exact model and manual before ordering any Thermador dishwasher parts.
Suggestions in this section are organized to support the troubleshooting flow first. Any future affiliate relationships should be disclosed clearly.
When Not to Keep Troubleshooting
Error persists after thorough cleaning — same path as E22/E24
How to Prevent It Recurring
- Clean filter every 4 weeks
- Scrape plates before loading
Related Error Codes
Extra notes
- This page is based on Thermador support material and stays conservative where model-specific guidance may vary.
- The goal is to help you identify safe first checks before you move into parts, service, or model-specific manual lookup.
Source and model notes
Last reviewed: 2026-04-09
Based on: Based on Thermador support material and edited into consumer-safe guidance for the exact code family on this page.
Model coverage note: Thermador dishwasher code meanings can vary by series, control panel, and model family, so use this page as a safe starting point rather than a replacement for the model-specific manual.
Important: FixThisError is an independent guide, not the manufacturer. Use your model-specific manual when the panel wording or behavior differs.
Always disconnect power before inspecting appliances. If unsure, contact a licensed appliance technician.