Symptoms
- Button stays pressed in and doesn't pop back up
- Pressing one side does nothing
- Flush happens on full every time regardless of button pressed
- Button feels loose or wobbly
Likely causes
- CommonDebris or mineral buildup around the button mechanismGrime inside the actuator can prevent it from returning to its resting position.
- CommonMisaligned or worn internal flush valve cartridgeThe dual-flush cartridge inside the tank controls both volumes, and a worn one can stick or fail to differentiate flushes.
- PossibleLoose button mountingThe plate holding the buttons can loosen, causing misalignment with the internal mechanism.
What to do
- Remove the tank lid and examine how the button connects to the internal dual-flush valve or cartridge.
- Clean around the button housing and its internal moving parts with a damp cloth to remove grime.
- Check that the button plate is screwed on tightly and sitting level.
- Test the flush valve cartridge by pressing each side manually from inside the tank to see if it responds correctly.
- Replace the dual-flush valve cartridge (available for most major brands) if it doesn't respond correctly or is visibly worn.
Tools and parts
- Screwdriver
- Damp cloth
Dual-flush valve cartridgeSearch: “dual flush toilet valve cartridge replacement”
When to call a pro
Call a plumber if you can't identify the correct replacement cartridge for your toilet model or the mechanism seems more deeply worn.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.