Seeing E15 on your Thermador dishwasher means the base-pan safety float switch has detected water where it shouldn’t be, and shut off the water inlet to prevent flooding.
Step 1: Turn Off the Water Supply
Locate the shutoff valve under the sink or behind the dishwasher and turn it off — regardless of whether the leak is real or the switch triggered falsely.
Step 2: Look for Standing Water
If safe to do so, gently check underneath and around the base for visible water. Don’t tilt or move the unit aggressively.
Step 3: Don’t Run Another Cycle
Don’t restart the cycle to see if it clears on its own. If there’s an active leak, running it again risks real water damage.
Step 4: Book a Diagnostic
The float switch is sensitive enough that even a small amount of residual water can keep it triggered — a technician can confirm whether this is a genuine leak or a false trigger. Visit our dishwasher repair page — E15 calls are one of the situations we prioritize for same-day dispatch.
Not Confident Doing This Yourself?
A factory-trained technician can diagnose and fix it safely, usually same-day.