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 remains, keep the dishwasher off until the drain path is reviewed.
- Inspect the visible drain hose without pulling out the appliance; if it is kinked, crushed, or twisted, correct only the exposed routing before one monitored retry.
- Examine only the owner-accessible filter after disconnecting power, letting hot water cool, and wearing suitable gloves; if debris is visible, remove it as the exact product manual describes.
- Ask the installer or a plumber to confirm the sink spigot, hose height, and blanking-plug removal when the dishwasher was recently installed; do not dismantle wet plumbing to test it.
Applicability
Regional guidance · Zanussi integrated and freestanding dishwashers · United Kingdom
This display family comes from Zanussi UK support; confirm the exact product-number manual because drain-height limits, filter construction, and owner access can differ by model and market.
Reset or retry steps
- Run one monitored programme only after a visible restriction is safely corrected, the filter is fully reinstalled, and no water is leaking.
- Stop further retries if i20 or a documented display variant returns or water remains in the tub.
When to call a technician
- Contact Zanussi service if the dishwasher still does not drain after visible hose and owner-accessible filter checks.
- Arrange qualified help immediately if water leaks, the drain hose is damaged, or hidden sharp debris prevents safe filter access.
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 open drain or pump areas while the appliance is powered.
- Do not bypass locks, float switches, leak sensors, or other safety systems.
Common causes include
- Sink spigot or household drain connection restricted
- Dishwasher filter or sump blocked by debris
- Drain hose kinked, twisted, damaged, or installed at the wrong height
- Sink-drain blanking plug left in place after installation
FAQ
What does Zanussi Dishwasher code i20 usually mean?
A drainage problem may leave water in the dishwasher tub. Model context matters: Zanussi UK groups i20, C2, F2, and AL6 with one drain condition; some controls may instead beep or flash twice.
Can I keep using the dishwasher with code i20?
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 filter access, and never reach into standing water or an unseen sump with bare hands because broken glass may be hidden there.
When should I call a technician for Zanussi i20?
Contact Zanussi service if the dishwasher still does not drain after visible hose and owner-accessible filter checks. A qualified technician may check Drain hose, Filter system, and Drain pump against the model's service information before treating any part as failed.