Plumbing Basics

Req 5c — Repairing a Toilet

5c.
Repair a flush toilet.

Most toilet problems feel mysterious until you lift the tank lid and watch how the parts work together. This requirement teaches a powerful home-repair lesson: many systems become easier once you can see the sequence of what is supposed to happen.

How to Fix a Running Toilet: The Two Most Common Causes (video)
Fix a Running Toilet...Fill Valve Replacement (video)

What to Observe

A toilet repair often starts with asking:

Watch the tank through one full flush cycle. That will often tell you what is not closing, lifting, or refilling correctly.

Cutaway toilet tank diagram showing the handle, chain, flapper, fill valve, float, and flush sequence

Toilet repair is a great example of how observation saves time. If you understand the sequence, you can focus on the part that failed instead of replacing things blindly.