Error code
Bosch Dishwasher Error Code E30
Bosch Dishwasher E30 usually means the dishwasher has detected a water safety, leak, or overfill-style problem. Check the safe external items first, then stop if the code returns or there is leaking, burning smell, or poor heating.
Quick answer
E30: what does it mean and how to fix
What does it mean?
the dishwasher has detected a water safety, leak, or overfill-style problem.
How to fix first
Switch the dishwasher off and isolate the power before checking accessible areas.
Why is this happening?
Water in the base or leak-protection area
When should I call an engineer?
Call a dishwasher engineer if the code returns after safe checks, water appears under the appliance, heating is affected, the pump is noisy or jammed, or diagnosis would require access inside the cabinet.
What does this error code mean?
Bosch dishwasher error code E30 usually points to a water safety warning, often linked to leak protection, overfilling, or an abnormal water-level condition.
Check first for visible water around the base, oversudsing, a blocked filter, or a drain restriction. If the dishwasher also shows anti-flood behaviour, compare it with Bosch dishwasher E15.
This warning usually points to leak protection, water-level control, drainage restriction, or base-tray water detection.
Symptoms users may notice
- The drain pump may keep running.
- Water may appear near the plinth or door.
- The code may return after a short reset if leak protection is still active.
Why is this happening?
- Water in the base or leak-protection area
- Overfilling or abnormal water-level reading
- Oversudsing pushing foam or water where it should not be
- Drain restriction causing water to back up
What this usually points to
This warning usually points to leak protection, water-level control, drainage restriction, or base-tray water detection.
How to fix this safely
- Switch the dishwasher off and isolate the power before checking accessible areas.
- Check for water around the plinth, door, and visible hose area.
- Clean the accessible filter and check for oversudsing or a blocked drain route.
- Run one short test only if the area is dry and there is no obvious leak.
Can I fix this myself?
MaybeYou can carry out simple external checks such as filters, hoses, visible water, and correct loading. Stop when the fault points to internal pumps, heaters, wiring, or controls.
Safety boundary: Disconnect power before accessible checks. Do not remove panels, bypass safety devices, work on wiring, or run the dishwasher if water may be reaching electrical parts.
What not to do
- Do not keep repeating resets if the same code comes back.
- Do not remove panels or work on internal wiring, pumps, valves, or heater parts.
- Do not ignore leaks, burning smells, or unusual pump noises.
Reset steps
- Restore power only after the safe external checks are complete and the area is dry.
- Run one short test programme if there is no visible leak, smell, or electrical concern.
- Stop if the code returns or the dishwasher fails to fill, heat, drain, or wash normally.
Intermittent vs persistent faults
A one-off warning may clear after safe external checks, but repeated Bosch dishwasher faults should be treated as a persistent problem that needs diagnosis.
When to call an engineer
Call a dishwasher engineer if the code returns after safe checks, water appears under the appliance, heating is affected, the pump is noisy or jammed, or diagnosis would require access inside the cabinet.
Safety warning
Disconnect the dishwasher from power before checking accessible filters, hoses, or seals, and do not remove panels or work on internal electrical, pump, heater, or valve parts yourself.
Useful hub links
Related leak and overflow fault codes
Bosch Dishwasher Error Code E15
The dishwasher anti-flood system has been triggered
Bosch Dishwasher Error Code E22
the filter or sump area is dirty, blocked, or restricting drainage.
Bosch Dishwasher Error Code E24
the dishwasher is not draining properly.
Bosch Dishwasher Error Code E25
the drain pump may be blocked or unable to move water properly.
Relevant guide
Frequently asked questions
What does Bosch dishwasher E30 mean?+
Bosch Dishwasher Error Code E30 usually means the dishwasher has detected a water safety, leak, or overfill-style problem.
How do I fix Bosch dishwasher E30?+
Start with safe external checks only: switch off power, inspect filters, hoses, water around the base, and the visible wash cabinet as relevant. If the code returns, arrange diagnosis.
Can I still use a Bosch dishwasher with E30?+
Do not keep using it normally while the code is showing. One short test is only reasonable after safe checks and only if there is no leak, smell, or electrical concern.
Model variation note
Bosch dishwasher code wording can vary by model. Use the exact model manual where available, and keep checks to safe user-accessible areas.