Toilet Won’t Flush

Red Seal Plumber

Andrew

A toilet that won’t flush is usually caused by a simple issue like a loose chain, low tank water level, or a clog that can often be cleared with a plunger or auger. This guide walks you through quick checks, safe DIY steps, and clear signs of when to call a licensed plumber.

Print Guide Pin Guide

Prep Time 5

Work Time 30

Total Time 35

Difficulty Beginner

Cost $0 - $100

Frequency As Needed

Tools & Equipment

1 Flat screwdriver est. $5–15
1 Adjustable pliers est. $15–30
1 Flange plunger est. $15–35
1 Toilet auger (6 ft, with bowl guard) est. $60–120
1 Wet/dry shop vacuum (optional) est. $80–150 (entry-level unit)
1 Gloves (disposable or reusable) est. $5–15

Parts & Supplies

1 Replacement toilet handle/lever est. $10–15
1 Toilet flapper est. $15–25
1 Fill valve assembly est. $35–60
1 Cleaning brush/descaler est. $8–20

Instructions

1. Repair the Handle and Chain
Remove the tank lid. Watch the chain as you press the handle.
Adjust slack to about 6–12 mm (¼–½ in).
Replace broken handles with universal replacements ($10–15).
2. Replace the Flapper
Signs of trouble: warped rubber, slimy buildup, water constantly running.
Shut off water, drain the tank, unclip the old flapper, and install a new one ($15–25).
Align it so it seals evenly over the flush valve.
3. Adjust the Water Level
Water should sit ~2.5 cm below the overflow tube.
Adjust clip on modern fill valves or gently bend the float arm.
Ensure shutoff valve is fully open.
4. Clear a Clog with a Plunger
Warm the rubber in hot water first for a tighter seal.
Cover the outlet fully, push slowly to expel air, then pump firmly 10–15 times.
Test flush once. If water rises, stop and wait before retrying.
👉 See detailed tutorials on UnclogToilets.com: How to Use a Plunger.
5. Use a Toilet Auger
Insert gently until you feel resistance.
Crank to break or hook the blockage.
Withdraw slowly to avoid scratching porcelain.
Flush to confirm clearance.
👉 Learn more on UnclogToilets.com: How to Use a Toilet Auger.
6. Service or Replace the Fill Valve
Shut off supply, remove cap, rinse debris.
If valve is brittle or worn, replace ($25–40).
Follow manufacturer’s instructions for installation.

Notes

Pro Tips

💡 Keep a dedicated toilet plunger — don’t share with sinks.
💡 Mark the correct water line inside your tank with a pencil for quick reference.
💡 Avoid chemical drain cleaners — they can crack porcelain and damage plumbing.
💡 If your toilet is older than 20 years, replacing it may save water and reduce future issues.