What to Do When Toilet Won't 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

First, check if the toilet is clogged. If it is, use a plunger to try to clear the blockage. If plunging doesn't work, you may need to use a toilet auger. If the toilet isn't clogged, the issue might be with the flush valve or handle.

Confirm the symptom

Water rises but doesn't flush when you press the handle.
Toilet makes gurgling sounds but doesn't flush.
Water level in the bowl is low or empty.
Handle feels loose or disconnected.
Toilet flushes weakly or slowly.

Tools and prep

Plunger
Toilet auger or snake
Gloves
Bucket
Towels
Flashlight
Safety glasses
Turn off water supply to the toilet by closing the valve behind the toilet.
Put on gloves and safety glasses.

Step-by-step troubleshooting

Check for a Clog
Do: Fill the toilet bowl with enough water to cover the plunger cup.
Observe: See if the water level rises and then goes down slowly.
Means: There might be a partial clog.
Next: Try plunging.
Use a Plunger
Do: Place the plunger over the drain hole and work it up and down vigorously.
Observe: Water level drops and flushes normally.
Means: Clog is cleared.
Next: Flush the toilet to ensure it's working.
Use a Toilet Auger
Do: Insert the auger into the toilet drain and extend it until you feel resistance.
Observe: Auger breaks through the clog.
Means: Clog is cleared.
Next: Flush the toilet to ensure it's working.
Check the Flush Valve
Do: Remove the toilet tank lid and inspect the flush valve at the bottom of the tank.
Observe: Flush valve is not sealing properly or is damaged.
Means: Flush valve needs replacement.
Next: Replace the flush valve.
Check the Flapper
Do: Inspect the flapper at the bottom of the tank.
Observe: Flapper is worn out or not sealing properly.
Means: Flapper needs replacement.
Next: Replace the flapper.
Check the Handle
Do: Inspect the handle and its connection to the flush lever inside the tank.
Observe: Handle is loose or disconnected.
Means: Handle needs adjustment or replacement.
Next: Adjust or replace the handle.
Check the Water Supply
Do: Ensure the water supply valve behind the toilet is open.
Observe: Water supply is off or restricted.
Means: Turn on the water supply valve.
Next: Flush the toilet to ensure it's working.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged Toilet Blockage in the drain pipe prevents water from flowing out.	Common	Easy	Plunger, Toilet Auger
Faulty Flush Valve Flush valve does not seal properly, causing water to leak into the bowl.	Sometimes	Medium	Flush Valve
Worn Out Flapper Flapper does not create a proper seal, leading to a weak flush.	Sometimes	Easy	Flapper
Loose or Broken Handle Handle is not properly connected to the flush lever.	Rare	Easy	Handle
Low Water Level Water level in the tank is too low to create enough force for a flush.	Sometimes	Easy	None
Partially Clogged Vent Stack Vent stack allows air into the drain system; a partial clog can cause flushing issues.	Rare	Hard	Professional help

Parts matching

Ensure you have the right parts before starting repairs. Most parts are universal but verify compatibility with your toilet model.

Plunger: Essential for clearing clogs.
Toilet Auger: For stubborn clogs that a plunger can't handle.
Flush Valve: Replaces the seal at the bottom of the tank.
Flapper: Creates a seal to hold water in the tank.
Toilet Handle: Connects to the flush lever inside the tank.
Safety Glasses: Protect your eyes from debris and chemicals.

Always turn off the water supply before replacing any parts inside the toilet tank.

When to call a professional

If the toilet is overflowing and you can't stop it.
If you suspect a sewer line issue.
If the toilet is damaged or cracked.
If you're not comfortable performing the repairs yourself.
If the problem persists after attempting DIY fixes.

FAQ

Can I use chemical drain cleaners to unclog my toilet?

It's best to avoid chemical drain cleaners as they can damage pipes and are harmful to the environment. Stick to mechanical methods like plunging or using a toilet auger.

How do I know if my toilet is clogged or if there's another issue?

If water rises in the bowl but doesn't flush, it's likely a clog. If the water level is low or the handle feels loose, the issue might be with the flush valve or handle.

What should I do if the toilet is overflowing?

Turn off the water supply immediately by closing the valve behind the toilet. If the water keeps rising, remove the tank lid and lift the float cup to stop water from entering the bowl. Call a professional if the overflow continues.