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The float mechanism works perfectly. The water outlet never stops, it keeps running, and we had to close the stopcock to avoid waste. It's a mezzanine floor, the internal patio drain is blocked, and the downpipe is poorly constructed. We believe the entire installation needs replacing. Every time it rains, we get flooded. This is a communal building issue, we need a quote for the community president. It's an old backpack cistern; the flat is from the 1960s. Two years ago, I replaced the flush valve with a new one (the blue and white plastic type). Now it's leaking into the bowl, and the tank seems to never stop filling. The stopcock is next to the tank.
