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Quick answer
If your toilet won't flush, check for a clogged drain, a stuck or broken flapper, or a faulty float. Turn off the water supply, inspect the tank, and clear any blockages. Replace worn parts if needed.
Confirm the symptom
- Toilet handle doesn't flush water into bowl
- Water doesn't drain after pressing handle
- Tank fills but no water enters bowl
- Handle feels loose or disconnected
Tools and prep
- Adjustable wrench
- Plunger (toilet plunger)
- Screwdrivers (flathead and Phillips)
- Bucket
- Plumbing snake (optional)
- Rubber gloves
- Turn off water supply to toilet
- Disconnect water line if needed
Step-by-step troubleshooting
- Check Water SupplyDo: Locate and turn the water supply valve under the toilet tank. Ensure it's fully open.Observe: Water flows into the tank when valve is open.Means: Valve was closed or partially closed.Next: If water flows, proceed to Step 2. If not, check for a clogged valve or water line.
- Inspect Flapper ValveDo: Remove the tank lid and lift the flapper. Check if it's stuck, torn, or not sealing properly.Observe: Flapper opens when handle is pressed and closes after flushing.Means: Flapper is damaged or misaligned.Next: Replace the flapper if damaged. If it works, move to Step 3.
- Test Flush Handle MechanismDo: Check the chain connecting the handle to the flapper. Ensure it's not too tight or loose.Observe: Chain moves freely and pulls the flapper open when handle is pressed.Means: Chain is improperly adjusted or broken.Next: Adjust or replace the chain. Test the flush again.
- Check for Clogs in Bowl or TrapwayDo: Use a plunger to try clearing any blockage in the bowl. For stubborn clogs, use a plumbing snake.Observe: Water drains freely after plunging or snaking.Means: A clog is preventing proper drainage.Next: If clog is cleared, test the flush. If not, proceed to Step 5.
- Examine Float and Fill ValveDo: Ensure the float isn't stuck or misaligned. Check the fill valve for proper operation.Observe: Float rises and falls with water level, and fill valve shuts off when tank is full.Means: Float or fill valve is faulty.Next: Adjust or replace the float or fill valve as needed.
- Test Tank to Bowl Water FlowDo: Manually lift the flapper to let water flow from the tank to the bowl. Observe the water flow.Observe: Water flows from tank to bowl and initiates a flush.Means: The tank-to-bowl water flow is unobstructed.Next: If water flows, the issue is likely with the flapper or handle mechanism. If not, check for a blockage in the overflow tube or tank outlet.
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Clogged Drain or Trapway A blockage in the bowl or trapway prevents water from draining, making the toilet appear not to flush. | Common | Easy–Medium | Plumbing snake |
| Faulty Flapper Valve A torn or misaligned flapper fails to open, preventing water from entering the bowl during a flush. | Common | Easy | Toilet flapper |
| Broken or Stuck Float A faulty float can prevent the tank from filling properly, leading to insufficient water for a flush. | Sometimes | Easy–Medium | Float or fill valve |
| Improper Chain Adjustment A chain that's too tight or loose can prevent the flapper from opening correctly. | Sometimes | Easy | Toilet chain |
| Blocked Tank Outlet or Overflow Tube Mineral deposits or debris can block the tank outlet or overflow tube, restricting water flow to the bowl. | Rare | Medium | Descale kit or brush |
| Damaged Fill Valve A faulty fill valve may not allow water to enter the tank, resulting in no water for a flush. | Sometimes | Medium | Fill valve assembly |
Parts matching
Replace these common parts if they're damaged or worn:
- Toilet flapper (e.g., Fluidmaster 400A)
- Toilet fill valve (e.g., Fluidmaster 400C)
- Toilet tank-to-bowl ballcock assembly
- Toilet chain (plastic-coated steel)
- Plumbing snake (hand-crank or electric)
Purchase parts specific to your toilet model for compatibility.
When to call a professional
- Toilet still doesn't flush after replacing all suspect parts
- You notice cracks or leaks in the toilet tank or bowl
- Clogs persist despite multiple attempts to clear them
- Water supply issues continue after checking valves and lines
FAQ
Why does my toilet handle move but not flush?
The handle may not be connected to the flapper or the chain may be too tight or loose. Check the linkage and adjust or replace as needed.
How do I know if my flapper is bad?
A bad flapper will either not open (no flush) or not close (water leaks into the bowl). Replace it if it's torn or doesn't seal properly.
Can a clogged toilet cause the flush to not work?
Yes, a clog in the bowl or trapway can prevent water from draining, making it seem like the toilet isn't flushing. Use a plunger or snake to clear the blockage.
Why is my toilet tank filling but not flushing?
The issue may be with the flapper valve or the tank-to-bowl water flow. Check for a blockage or a faulty flapper.