Toilet Does Not Refill (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

Turn off the water supply, check the fill valve and float for blockages or damage, and ensure the water supply valve is fully open. Replace faulty parts if needed.

Confirm the symptom

Toilet tank doesn't refill after flushing
Water runs continuously but doesn't fill the tank
Toilet makes gurgling sounds but no refill

Tools and prep

Adjustable wrench
Screwdrivers (flathead and Phillips)
Plumber's putty or wax ring (if replacing toilet)
Flashlight
Bucket or towel
Replacement parts (fill valve, float, etc.)
Turn off water supply to the toilet before starting

Step-by-step troubleshooting

Check Water Supply Valve
Do: Locate the shutoff valve near the base of the toilet and ensure it is fully open.
Observe: Water flows through the valve.
Means: Valve is open and functional.
Next: If no water flows, check for a clogged valve or main water supply issue.
Inspect Fill Valve
Do: Look inside the tank at the fill valve. Check for debris or mineral buildup.
Observe: Valve is clogged or damaged.
Means: Valve is preventing water from entering the tank.
Next: Clean or replace the fill valve.
Adjust or Replace Float
Do: Check the float for damage or improper positioning. Adjust the float arm or replace it if necessary.
Observe: Float is stuck or set too low.
Means: Float is not allowing the valve to open properly.
Next: Adjust the float height or replace it with a new one.
Check Flapper or Flush Valve
Do: Ensure the flapper is sealing properly and not stuck open.
Observe: Flapper does not close fully or is damaged.
Means: Water is escaping, preventing the tank from refilling.
Next: Replace the flapper or adjust its position.
Test for Clogs in Supply Line
Do: Turn on the water supply and listen for water flow into the tank. If no water flows, check the supply line for clogs.
Observe: No water enters the tank despite the valve being open.
Means: Supply line is clogged or frozen.
Next: Clear the clog or call a professional if it's frozen.
Inspect Toilet Tank for Leaks
Do: Look for water on the floor or around the base of the toilet. Check the tank for cracks or leaks.
Observe: Water is leaking from the tank or base.
Means: Tank or toilet is damaged and needs repair or replacement.
Next: Replace the toilet or repair the tank if possible.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged Fill Valve Mineral deposits or debris block water flow into the tank.	Common	Easy	Fill valve
Faulty Float Mechanism Float is stuck or set too low, preventing the valve from opening.	Common	Easy	Float
Closed or Clogged Water Supply Valve Valve is shut off or blocked, preventing water from reaching the toilet.	Common	Easy	Water supply valve
Damaged Flapper or Flush Valve Flapper does not seal properly, allowing water to escape.	Sometimes	Easy	Flapper
Clogged Supply Line Debris or mineral buildup in the supply line restricts water flow.	Sometimes	Medium	Plumbing snake or replacement line
Leaking Toilet Tank Cracks or leaks in the tank prevent proper water retention.	Rare	Hard	Toilet replacement

Parts matching

Common parts needed to fix a toilet that doesn't refill include:

Fill valve (also called ballcock)
Float (ball float or cup float)
Flapper or flush valve
Water supply valve
Plumbing snake (for clearing clogs)

Purchase parts compatible with your toilet model. Check the manufacturer's website for specifications.

When to call a professional

Water supply line is frozen or severely clogged
Toilet tank is cracked or damaged beyond repair
Multiple attempts to fix the issue fail
You suspect a main water line issue
You are unsure about electrical or complex plumbing connections

FAQ

Why does my toilet not refill after I flush it?

Common causes include a clogged fill valve, a faulty float mechanism, or a closed water supply valve. Check these components first.

How do I know if my fill valve is bad?

If water doesn't flow into the tank or runs continuously without stopping, the fill valve may be faulty and need replacement.

Can I replace the fill valve myself?

Yes, replacing a fill valve is a common DIY task. Turn off the water supply, drain the tank, and follow the manufacturer's instructions for installation.

What if adjusting the float doesn't work?

If adjusting the float doesn't resolve the issue, the float mechanism may be damaged and require replacement.

Why is there water on the floor near the toilet?

Water on the floor may indicate a leak in the tank, base, or supply line. Inspect these areas for damage or wear.