What to check first
Stop normal operation while this warning is active. Follow only the documented safe checks or protective-drain instructions for the exact model.
Basic checks
- Observe the tub after the programme stops; if standing water, foam, or a leak is visible, keep the dishwasher off.
- Inspect only the user-accessible filter after disconnecting power, letting hot water cool, and putting on suitable gloves; if the manual does not show owner access, stop and arrange service.
- Clear only visible foam or debris from the accessible filter area; if access would expose the pump, pressure system, or cabinet, stop without opening it.
- Reinstall every filter part exactly as the model manual shows; stop if a part is damaged, stuck, or will not seat normally.
Applicability
Regional guidance · AEG integrated and freestanding dishwashers · United Kingdom
This display family comes from AEG UK support; confirm the exact product-number manual because pressure systems, filter construction, and code availability can differ by model and market.
Reset or retry steps
- After the accessible filter area is clean, correctly reassembled, and dry, leave power off for about five minutes and try one monitored programme.
- Stop further retries if i40 or a documented variant returns, water remains, or filling and draining are not normal.
When to call a technician
- Contact AEG service if the code returns after the powered-off filter and sump check.
- Arrange service immediately if water leaks, an electrical smell appears, or broken glass prevents safe access to the user-cleanable filter.
Before approving a paid visit, check warranty status and reviewquestions to ask before repair.
Can I keep using it?
Stop normal use when water is visible or a leak warning is active. Stay clear if water could reach wiring or controls.
- Safe next step
- Follow the code-specific shutdown or protective-drain instructions, turn off water when appropriate, and avoid repeated resets. Do not interrupt a documented protective-drain sequence just to clear the display.
- Stop when
- Water is near wiring, cabinetry is getting wet, the leak returns, or the source is not safely visible.
Do not keep using the appliance if the code points to voltage, wiring, control power, burning smell, smoke, or a possible miswired supply.
- Safe next step
- Use only safe owner-level power checks, then involve a qualified technician or electrician when the source points to wiring or supply voltage.
- Stop when
- Breakers trip, lights dim, the appliance smells hot, wiring may be miswired, or the warning returns after a safe reset.
Safety boundaries
Safe first
- Match the exact brand, appliance type, and displayed code first.
- Use the model manual as the final authority for access steps.
- Stop and address visible water before retrying the appliance.
- Disconnect power before any service-access step.
Do not do this
- Do not continue normal cycles while this code is active; any protective-drain sequence must follow the exact model instructions.
- Do not bypass locks, float switches, leak sensors, or other safety systems.
Common causes include
- Foam or excess suds visible in the sump
- Debris restricting the user-accessible dishwasher filter
- Possible pressure-sensor or water-level-control fault
FAQ
What does AEG Dishwasher code i40 usually mean?
Usually indicates a pressure-sensor or water-level-control condition. Model context matters: AEG UK groups i40, i41, i43, and i44 with four beeps or flashes; the exact display depends on the dishwasher controls.
Can I keep using the dishwasher with code i40?
Stop normal operation until the issue and safety warnings have been addressed. Follow only the documented safe checks or protective-drain instructions for your model. Disconnect power before touching the filter area, and do not reach into standing water or hidden sump openings with bare hands.
When should I call a technician for AEG i40?
Contact AEG service if the code returns after the powered-off filter and sump check. A qualified technician may check Pressure sensor, Water-level control components, and Filter system against the model's service information before treating any part as failed.