Toilet Won't Flush: Fix It Yourself

Quick answer

If your toilet won't flush, first check for a clog using a plunger or toilet auger. Ensure the water supply valve under the tank is fully open. If the tank isn't filling, check the float ball or fill valve for issues.

Confirm the symptom

• Toilet handle won't move or feels stuck
• Water doesn't flow into the bowl when you press the handle
• Tank doesn't refill after flushing
• Toilet flushes weakly or not at all
• No water in the bowl or tank

Tools and prep

• Rubber plunger
• Toilet auger (snake)
• Adjustable wrench
• Screwdriver
• Bucket
• Turn off water supply under the toilet tank
• Wear rubber gloves to avoid contact with waste

Step-by-step troubleshooting

1. Check Water Supply Valve
   Do: Locate the shut-off valve under the toilet tank and ensure it's fully open.
   Observe: Water flows into the tank when the valve is open.
   Means: If no water flows, the valve is closed or clogged.
   Next: Clean or replace the shut-off valve.
2. Inspect for Clogs
   Do: Use a plunger to try clearing any blockage in the bowl.
   Observe: Water level in the bowl decreases and flushes normally after plunging.
   Means: A clog was preventing the flush.
   Next: If plunging doesn't work, use a toilet auger.
3. Use Toilet Auger
   Do: Insert the auger into the bowl and rotate the handle to break up or remove the clog.
   Observe: The auger meets resistance or pulls out debris.
   Means: A solid object or buildup is causing the blockage.
   Next: Flush the toilet to see if the clog is cleared.
4. Check Flapper Valve
   Do: Lift the tank lid and inspect the flapper valve for damage or mineral buildup.
   Observe: Flapper doesn't seal properly or is stuck open.
   Means: A faulty flapper prevents water from flowing into the bowl.
   Next: Clean or replace the flapper valve.
5. Adjust Float Ball or Fill Valve
   Do: Check the float ball or fill valve to ensure it's not stuck or misaligned.
   Observe: Water level in the tank is too low or the float doesn't rise properly.
   Means: The float mechanism isn't allowing the tank to fill correctly.
   Next: Adjust the float or replace the fill valve if necessary.
6. Test Flush Mechanism
   Do: Press the handle and observe the chain connected to the flapper.
   Observe: Chain is too loose or too tight, preventing the flapper from opening.
   Means: Improper chain tension affects the flush.
   Next: Adjust the chain length for proper operation.
7. Inspect Tank to Bowl Bolt
   Do: Check if the tank is loose or leaking around the bolts connecting it to the bowl.
   Observe: Water leakage or a loose tank that shifts when flushed.
   Means: A loose tank can disrupt the flushing mechanism.
   Next: Tighten or replace the bolts and wax ring if needed.
8. Check for Main Sewer Line Blockage
   Do: If multiple toilets or drains are affected, check for a main sewer line blockage.
   Observe: Other fixtures also drain slowly or don't work.
   Means: A larger plumbing issue is present.
   Next: Call a professional plumber for inspection and clearing.

Common causes

Parts matching

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

• Toilet plunger
• Toilet auger
• Shut-off valve
• Flapper valve
• Fill valve
• Tank bolts
• Adjustable chain

Purchase a toilet repair kit that includes flapper valves, fill valves, and tank bolts for common fixes.

When to call a professional

• Multiple toilets or drains are affected, indicating a main sewer line issue.
• You can't clear the clog with a plunger or auger.
• Water continues to leak from the tank despite replacing parts.
• The toilet is old and requires extensive repairs.
• You're unsure about the cause after following troubleshooting steps.

FAQ

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