What should I do if my toilet won't flush but is not clogged?

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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