If all else fails, sometimes swapping out the flush mechanism for a better aftermarket one helps.
I’ve had to do this in a few of my rentals. Some of those dual-flush setups just aren’t built to last, especially the cheaper models. Before you go that route, double-check the chain or cable adjustment too—if it’s too loose, the half flush won’t lift the flapper enough. Had one where tightening it just a notch made all the difference. Sometimes it’s the simplest fix that gets overlooked.
Funny timing—just had this exact issue in one of my older units last month. The tenant swore the half flush was useless, but when I checked, the chain was actually catching on the fill valve a bit. Moved it over just a hair and it started working fine... Sometimes I wonder if these dual-flush things are more trouble than they're worth. Anyone else notice the buttons get sticky over time?
Yeah, those dual-flush setups can be a real mixed bag. I’ve lost count of how many times I’ve been called out for “half flush not working” and it’s almost never the actual mechanism failing—it’s always something like the chain snagging, or the button not lining up right after a few years of use. The sticky button thing is spot on too. I’ve noticed it’s usually from mineral buildup or just gunk from people with wet hands pressing the buttons all the time. Sometimes a quick clean under the button cap sorts it, but other times the plastic just wears out and you’re stuck replacing the whole actuator.
Honestly, I get why people like the water savings, but in rentals or places with a lot of turnover, they seem to cause more headaches than the old single-lever jobs. Tenants don’t always know how gentle you have to be with those buttons, and if they jam one down too hard, it can throw the whole thing out of whack. Had one where the button got stuck halfway and just kept running water until someone noticed the sound hours later—water bill was not pretty that month.
I will say, though, some brands hold up better than others. The cheaper ones from the big box stores seem to get sticky faster, while the pricier ones (like Caroma or Geberit) are a bit more forgiving. Still, even those need a bit of TLC every now and then. I’ve started keeping a couple spare button assemblies in my kit just because it’s such a common callout.
Funny thing is, half the time it’s just a matter of explaining to folks how the thing’s supposed to work. People expect it to flush like a regular toilet, but if you don’t hold the button down long enough, you barely get a trickle. Not exactly intuitive for everyone.
Anyway, you’re definitely not alone dealing with these quirks. Sometimes I miss the days when a toilet was just a handle and a flapper... less efficient maybe, but at least you knew what you were getting into.
I get where you’re coming from, but I’m not sure going back to the old single-lever toilets is the answer, especially with how much water they waste. Isn’t it worth a little extra maintenance if it means saving thousands of liters a year? I do wonder if some of these issues are more about installation or user habits than the design itself. Have you tried switching to the touchless flush models? I’ve heard they cut down on the sticky button problem, though I guess that’s just trading one set of quirks for another. Still, I’d rather deal with a finicky button than waste water every flush... but maybe that’s just me.
Yeah, I agree—most of the time, half flush issues come down to either a bad install or cheap parts. Touchless models are decent, but they have their own headaches with sensors acting up. Still, anything’s better than wasting water every single flush.