The toilet flush is not working.
scia-CQU-o-ne — three syllables, stress on the second. 'sci' = 'sh'.
A basic sanitary failure that must be reported immediately and fixed within the hour.
'Sciacquone' = toilet flush mechanism (the cistern or flush button). 'Non funziona' = does not work. Italian toilets have various flush systems — some with two buttons (half-flush and full-flush), some with a handle, some with a pedal.
Il WC non si svuota.
The toilet does not empty.
An alternative description of a flush failure
Il bottone dello sciacquone è rotto.
The flush button is broken.
Identify the specific component that failed
Lo sciacquone continua a scorrere.
The flush keeps running continuously.
A running toilet wastes water and the noise is disruptive
Italian toilet flush systems vary widely — from the classic high-cistern chain pull in very old hotels, to dual-button systems on modern cisterns, to push-plate flush mechanisms in contemporary bathrooms. If you cannot find the flush mechanism, ask at reception rather than struggling.