Match the symptom, then work through the safe checks.
1. What best matches what you observe?
2. Complete only the checks that are safe for you.
Show stop conditions
- Water is near a plug or wiring
- Leak continues while off
- The appliance must be tilted or opened
Likely causes
- Water reached the base or leak sensor
- A hose, seal, pump, or connection leaks
- Excess suds pushed water into the base
- Drain installation causes backflow
Quick checks, in order
Turn off power and water
Do not continue while leak protection is active.
Inspect visible connections
Check hoses, door seal, and nearby plumbing without opening panels.
Look for excess foam
Incorrect detergent can trigger leak protection.
Find the source before resetting
Drying the base without fixing the leak is not a repair.
What happens when E30 appears?
Keep power and water off until the leak is repaired.
Water may remain in the base or the sensor circuit may be active.
Correct detergent use and inspect for base water.
Stop and get qualified help when
- Water is near a plug or wiring
- Leak continues while off
- The appliance must be tilted or opened
Official support and model manuals
Use the full model number from the rating label. The manufacturer manual is the deciding reference when codes differ by region or product family.
Frequently asked questions
What does E30 mean on a Bosch dishwasher?
On many model families, E30 indicates that the leak-protection system is active. Confirm the exact model and region because the same display can be used differently.
Can I clear E30 by unplugging the dishwasher?
A short power reset may clear a temporary state, but it will not fix a blocked hose, leak, failed sensor, motor, heater, or wiring fault. Stop if the code returns.
Should I replace a part based only on the code?
No. A code identifies a system or condition, not always the failed component. Complete safe external checks and use the model-specific manual or qualified service.