What E9240 Means
Thermador publishes E9240 with the longest homeowner checklist of any of its dishwasher numbers, and every item on it is about the water getting out: the filter, the drain pump and its cover, the drain hose, and the airgap fitting. It is the four-digit generation’s broad drainage complaint.
Common Causes of E9240
- A filter packed with food debris after months without cleaning
- Debris caught under the drain pump cover
- A drain hose kinked or bent sharply behind the cabinet
- An airgap fitting silted up with grease and grounds
🔧 One Safe Check You Can Try
Work the list in order. Pull the filter and wash it under running water with a soft brush; take off the drain pump cover and clear it; check the drain hose for a bend; clear the airgap if one is fitted. Then run a rinse cycle to see whether the number returns.
⚠ Why You Shouldn't Go Further Than That
- If the whole drain path is clear and the code returns on the test rinse, the pump itself or the board channel driving it is the remaining candidate.
- A drain hose that has to be re-routed usually means moving the machine, which risks the water connection if it is done in a hurry.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.