Why Won't My Toilet Flush (Troubleshooting Guide)

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Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

If your toilet won't flush, check for a clogged drain, a stuck or broken flapper, or a faulty fill valve. Turn off the water supply, clear any blockages, and adjust or replace parts as needed.

Confirm the symptom

Toilet handle doesn't move when pressed
Water doesn't enter the bowl when handle is pressed
Toilet doesn't siphon water out of the bowl
Toilet handle feels loose or disconnected

Tools and prep

Toilet plunger
Adjustable wrench
Screwdriver (flathead and Phillips)
Bucket
Rubber gloves
Toilet auger (optional)
Turn off water supply to the toilet
Wipe up any standing water to avoid slipping

Step-by-step troubleshooting

Check Water Supply
Do: Locate the shut-off valve near the base of the toilet and ensure it's fully open.
Observe: Water should flow into the tank when the valve is open.
Means: If no water flows, the valve may be closed or clogged.
Next: Clean or replace the shut-off valve.
Inspect the Flapper
Do: Remove the tank lid and lift the flapper to see if it seals properly.
Observe: The flapper should close tightly after flushing.
Means: A faulty flapper can prevent water from entering the bowl.
Next: Adjust or replace the flapper.
Check the Chain
Do: Ensure the chain connecting the flapper to the handle is not tangled or too long.
Observe: The chain should have a slight tension but not be too tight.
Means: A loose or tangled chain can prevent the flapper from lifting.
Next: Adjust the chain length or reposition it.
Test the Flush Handle
Do: Check if the handle is loose or disconnected from the internal mechanism.
Observe: The handle should move freely and connect securely to the arm.
Means: A broken handle or arm can prevent the flapper from lifting.
Next: Tighten or replace the handle and arm.
Clear the Drain
Do: Use a plunger to clear any blockage in the bowl.
Observe: Water should drain from the bowl after plunging.
Means: A clogged drain can prevent proper flushing.
Next: If plunging doesn't work, use a toilet auger.
Adjust the Float
Do: Check the float's position and adjust it so the water level is about 1 inch below the overflow tube.
Observe: The water should stop filling once it reaches the correct level.
Means: An improperly set float can cause insufficient water in the tank.
Next: If the float is damaged, replace it.
Inspect the Fill Valve
Do: Check if the fill valve is functioning correctly and not leaking.
Observe: Water should flow steadily into the tank after flushing.
Means: A faulty fill valve can prevent the tank from refilling properly.
Next: Adjust or replace the fill valve.
Check for Clogs in the Trapway
Do: Use a toilet auger to clear any blockage in the trapway or drain line.
Observe: The auger should pass through the trapway without resistance.
Means: A clogged trapway can prevent proper drainage.
Next: If the clog is deep, consider calling a professional.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged Drain A blockage in the bowl or drain prevents water from flowing out.	Common	Easy	Toilet plunger
Faulty Flapper A damaged or improperly sealed flapper prevents water from entering the bowl.	Common	Easy	Toilet flapper
Stuck or Broken Handle A loose or broken handle can prevent the flapper from lifting.	Sometimes	Easy	Toilet handle and arm
Incorrect Float Level An improperly set float can result in insufficient water in the tank.	Sometimes	Easy–Medium	Float adjustment kit
Faulty Fill Valve A malfunctioning fill valve can prevent the tank from refilling properly.	Sometimes	Medium	Fill valve
Clogged Trapway A blockage in the trapway or drain line can prevent proper drainage.	Rare	Hard	Toilet auger
Low Water Supply A closed or clogged shut-off valve can prevent water from entering the tank.	Rare	Easy	Shut-off valve
Worn-Out Toilet Components Aging parts like the flapper or fill valve can wear out and stop working.	Sometimes	Medium	Toilet repair kit

Parts matching

Common parts needed to fix a toilet that won't flush include:

Toilet plunger
Toilet flapper
Toilet handle and arm
Fill valve
Float adjustment kit
Toilet auger
Shut-off valve

Purchase a toilet repair kit that includes common replacement parts to address multiple issues at once.

When to call a professional

The toilet still won't flush after trying all troubleshooting steps
You notice a major leak or water damage
You suspect a deep clog in the main sewer line
You're uncomfortable working with plumbing components
The toilet is old and may need replacement

FAQ

Why is my toilet handle loose?

A loose toilet handle is usually due to a worn-out screw or a broken linkage. Tighten the screw or replace the handle and linkage arm.

How do I know if my flapper is faulty?

If the flapper doesn't seal properly or doesn't lift when you flush, it's likely faulty and needs adjustment or replacement.

Can a clogged drain cause my toilet not to flush?

Yes, a clogged drain can prevent water from draining properly, causing the toilet to not flush effectively.

How do I adjust the float on my toilet?

Locate the float in the tank and adjust it so the water level is about 1 inch below the overflow tube. This ensures the tank fills to the correct level.

What should I do if my toilet won't flush and there's no water in the tank?

Check the shut-off valve near the base of the toilet to ensure it's fully open. If water still doesn't flow, the valve may be clogged and needs cleaning or replacement.