If your toilet won’t flush and there’s no visible clog, check the tank parts and water supply. Many no-flush issues come from a closed valve, low tank water, or a loose flapper chain.
Quick checks:
- Make sure the water supply valve behind the toilet is fully open.
- Lift the tank lid: confirm water reaches the fill line.
- Ensure the flapper chain has slight slack and isn’t tangled.
- Inspect the flapper for wear; replace if warped.
- Check the handle/lever linkage for looseness.
- Listen for a hiss after filling; a failing fill valve may need replacement.
Updated: 2025-12-24
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