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Quick answer
For the Zanussi ZDT21001FA, three beeps with the drain pump running continuously match Zanussi's i30 guidance: a water leak has been detected and the anti-flood device may be on. Close the water tap, switch the dishwasher off, and keep it disconnected while you check only the accessible load, spray-arm movement, filters, sump, and door gasket. Zanussi says the error may clear after the base dries overnight, but the underlying leak can return; if three beeps or constant draining returns, close the tap and arrange an authorised repair. Do not remove the base, probe the anti-flood sensor, or keep running cycles to test it.
Work through in order
Diagnostic checks
Use only checks that match the exact appliance or system and its official guide.
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Check 1
Close the dishwasher's water tap and switch the appliance off; disconnect it from power only if the plug or accessible isolator is dry and safe to reach.
Expected result: The water supply is closed and the drain-pump sound stops, or the appliance cannot be safely isolated at the accessible control.
Next step: Keep the tap closed and the dishwasher off. If power or water isolation is not safely accessible, stop and arrange an authorised technician instead of moving the appliance.
Why this matters
Why: The three-beep/i30 condition is associated with a possible water leak and anti-flood protection, so preventing further water entry is the first safety step.
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Check 2
With the appliance off, inspect only the accessible load and door area: make sure no large item blocks a spray arm, the spray arms can turn freely by hand, the filters and sump are visibly clean, and the door gasket is clean and undamaged.
Expected result: A blocked spray arm, deflected load, dirty filter/sump, or damaged gasket is visible, or none of those accessible conditions is present.
Next step: Correct only the visible loading or cleaning issue without opening the cabinet. If the gasket is damaged or no external cause is visible, keep the tap closed and arrange repair.
Why this matters
Why: Zanussi identifies loading, spray-arm obstruction, filters, sump, and the door gasket as external conditions that can contribute to water reaching the base; a clear inspection does not rule out an internal leak.
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Check 3
Leave the dishwasher powered off with the water tap closed for several hours or overnight so any water in the base can dry; do not tip the machine or remove its base.
Expected result: After the drying period, the warning is gone when the exact official procedure permits a cautious restart, or the three beeps/pump operation returns immediately.
Next step: If the warning returns, close the tap again and book an authorised repair. Do not repeat restart cycles to suppress the warning.
Why this matters
Why: Zanussi says i30 can temporarily disappear after the machine is left off with the water supply turned off, but the underlying leak may remain and cause the error to return.
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Check 4
Record the full model ZDT21001FA and the Product/PNC number from the rating plate before contacting Zanussi or ordering any part.
Expected result: The PNC is readable, or only the model name is available.
Next step: Give the model and PNC to an authorised service provider. Do not order a pump, sensor, hose, or base component from the three-beep symptom alone.
Why this matters
Why: Zanussi's official parts page lists several PNC versions for ZDT21001FA and requires the PNC to show compatible spares and diagrams; the model name alone does not establish part fit.
Use your observations
Decision map
Find the observation that best matches what you see, then follow the next safe action.
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PATH 01Next step
What you see
Three beeps or three flashes occur with constant draining, and the water tap is now closed.
Do this next
Keep the dishwasher off, perform only the accessible load, spray-arm, filter, sump, and gasket checks, then use authorised repair if the warning persists or returns.
Why this path and its safety boundary
Why it matters: This matches Zanussi's i30 anti-flood/water-leak warning pattern; it is not proof of one specific failed component.
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PATH 02Next step
What you see
A visible loading, spray-arm, filter, sump, or gasket condition is corrected and the warning does not return after the official drying and cautious restart guidance.
Do this next
Monitor without repeated test cycles. Close the tap and book repair if any water, three-beep warning, or constant draining returns.
Why this path and its safety boundary
Why it matters: The event may have been related to that accessible condition, but the result does not prove that no leak exists.
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PATH 03Next step
What you see
The warning returns after drying, or water is visible under the appliance or at an inaccessible location.
Do this next
Keep the water tap closed and arrange repair; do not remove the base, bypass the anti-flood device, or test internal parts.
Why this path and its safety boundary
Why it matters: Zanussi treats a returning i30 condition or internal leak as a service issue requiring an authorised technician.
Helpful context
Understand the symptom
What three beeps mean on this symptom
Zanussi's official i30 guidance lists three beeps or three flashes, a drain pump that runs constantly, and the anti-flood device being on. It says i30 may indicate an internal leak with water collecting in the base. That identifies the protected condition; it does not identify a particular hose, pump, seal, or sensor as the failed part.
Use the exact model and PNC for parts or service
The official Zanussi parts page lists ZDT21001FA but requires the Product/PNC number to display compatible spares and diagrams. Keep that model-and-PNC identity with any service request. The exact Reddit report matches the model and symptom, but its community repair suggestions do not replace the official instruction to close the water supply and use an authorised technician when the warning returns.
When checks do not resolve it
Need a professional?
Call an authorised Zanussi service provider if the warning returns after the water tap is closed and the dishwasher has dried, if water is leaking, or if any check would require moving the appliance, removing the base, or accessing internal wiring or sensors.
Common questions
FAQ
Do three beeps mean the drain pump itself is bad?
No. Zanussi maps three beeps and constant draining to i30, water leak detection, and anti-flood protection. The warning narrows the condition but does not prove a failed pump or another single part.
Can I keep restarting the dishwasher until the beeps stop?
No. Zanussi says the warning may disappear after the machine dries with the water supply off, but it can return if the underlying leak is not fixed. Keep the tap closed and arrange repair if the warning returns.
Why do I need the PNC if I already know the model?
The official ZDT21001FA parts page lists multiple PNC versions and requires the Product/PNC number before showing compatible spares and diagrams. Do not infer fitment from the model name or beep pattern alone.
Read the exact guide
Official sources
- Model: ZDT21001FA - Spares & Accessories - ZanussiZanussi · Opened the official Zanussi model page. It identifies ZDT21001FA as a dishwasher and requires the Product/PNC number to display compatible spares and diagrams; it lists multiple PNC versions.
- Dishwasher displays error code i30Zanussi · Opened Zanussi's official support article. It applies to integrated and freestanding Zanussi dishwashers and explicitly maps three beeps, constant pump operation, and the anti-flood device to i30/water-leak detection.
- Zanussi ZDT21001FA dishwasher stuck draining (anti flood?) 3x beepsReddit r/appliancerepair · Opened the exact Reddit post. It identifies the model, reports three beeps with draining, and quotes the model manual's anti-flood wording. It is used for symptom identity only; official Zanussi guidance supplies the diagnosis boundary and actions.
Community feedback
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