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Restore Water and Adjust Level — Check the Toilet Tank Water Level

Beginner

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Fix a Toilet That Won't Flush: Troubleshooting Guide · Step 1 of 3

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In this video

Turn the water supply valve counter-clockwise to turn the water back on. Let the tank fill completely. Check the water level against the manufacturer's line inside the tank. If adjustment is needed, turn the large screw on top of the fill valve float. Turning it counter-clockwise lowers the water level, and clockwise raises it. The final level should be about one inch below the top of the overflow tube.

Goal: Repair Running Toilet (Flapper Valve)

Used in this video

  • Screwdriver (brand: Unspecified) · optionalAdjusting the water level screw on the fill valve float. Many can be adjusted by hand.
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FAQs

How difficult is it to fix a toilet that won't flush, and how long does it usually take?

This is typically a beginner-level DIY repair, making it very accessible. Most issues, like adjusting the chain or water level, can be fixed in 10-20 minutes. Replacing a flapper might take slightly longer, around 30 minutes, especially for first-timers, but is still straightforward.

What essential tools do I need for this toilet repair, beyond the cutting pliers mentioned?

Besides the Angled Head Diagonal Cutting Pliers for chain adjustment or replacement, you'll primarily need a good pair of waterproof gloves for hygiene. A sponge or old towel can be useful for drying the tank if you replace the flapper, and a bucket might be handy to catch any remaining water.

Are there any important safety precautions I should take before starting this repair?

Always turn off the water supply valve behind the toilet before working inside the tank to prevent accidental overflows. Wear gloves to maintain hygiene, as toilet tanks can harbor bacteria. Avoid using harsh chemicals to clean inside the tank, as they can damage components.

I've adjusted the chain, and the water level is correct, but my toilet still flushes poorly or runs constantly. What else could be wrong?

If the chain and water level are correctly adjusted, the issue is likely with the flapper itself. Even if it doesn't look visibly damaged, an old, stiff, or ill-fitting flapper can cause leaks and poor flushing. Replace the flapper to ensure a tight seal and proper water release for optimal function.

Transcript
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After you replace all of this, you won't have to come back here for many, many years. Now let's get the water on and get it filled up. As you can see, the water stopped at the right level. It's not overflowing. There's no squeaking sound like you used to. However, in your case, if there is too much water in the tank, you can adjust the floater by turning it off to the left or counterclockwise. Or if there is not enough water, you can turn it clockwise to let more water in.

Auto-generated transcript. May contain errors.