VERIFIED
You cleaned it, then the code came up
It is a common and slightly maddening sequence: the dishwasher smelled a bit, so you pulled the filter, scrubbed it, ran a cleaning cycle, and now E04 is on the display. It feels like you broke something. More often, something you moved is just not seated, though a code can also be coincidence.
Where E04 stands
E04 has no single confirmed meaning across Bertazzoni dishwasher generations. The sensible approach is to treat it as a prompt to check what changed recently and to record when the code appears, rather than guess at a pump or board. The two-stage filter catches food particles before the pump, so a filter that is not locked can change how water moves without any part being faulty.
Retrace the cleaning steps
- Is the cylindrical filter turned until it locks, and is the flat micro-filter beneath it sitting flat in its recess?
- Did a spray arm get knocked loose or put back on crooked?
- Was the tub wiped with a cloth that left a scrap behind, such as a sponge piece?
- Did you use an unusual amount of cleaner that could have left foam?
Foam is worth ruling out first. Extra suds from hand dish soap, or a rinse aid spill, can confuse a machine that is watching water movement. If the tub looks foamy, a rinse cycle with nothing added is a harmless thing to try.
What to do if it comes back
Reseat the filters, close the door firmly, and start a short rinse. If E04 returns in the same part of the cycle each time, write down which stage that is and how far it got. A code that appears while the tub is filling points to a different part of the cycle than one that appears while draining. A code that always lands in the first minutes is a different clue than one that appears when the machine is circulating water.
When it is more than a seating issue
Some owners find that the code was already building and the cleaning only made them look. If it persists once the filters and arms are confirmed correct, the technician will look at the circulation side and the sensing the control uses to confirm it. The circulation pump drives water through the spray arms, and the control watches for evidence that this is happening. A written estimate follows the diagnosis, and no part is swapped unless you agree.
Avoid reaching below the filter well with tools. The pump housing sits there and is not made for cleaning from the top.
Frequently asked questions
Unlikely. Pulling and rinsing the filter is the normal maintenance. The usual issue is a part not seated, which you can correct.
It can interfere with how the machine tracks water, so a foamy tub is worth rinsing out before assuming a fault.
If E04 returns after one properly reseated run, there is little reason to wait further.
Not necessarily. Meanings can differ between control generations, so the model number decides.
Model compatibility: Bertazzoni reuses codes across series and model years, so E04 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
