Find the cause first, then fix it.
Most home repairs go wrong because the wrong part gets replaced. Each RepairClue guide starts with a quick diagnosis, then walks you through the fix, the real cost, and the point where a licensed pro is the safer call.
Browse by system
- Appliances
How washers, dryers, dishwashers, refrigerators and ovens fail, the checks that solve most problems without a service call, and the electrical and gas hazards that make some repairs a technician's job.
- Electrical
How a home's electrical system is laid out, which electrical problems a homeowner can safely check, and where the job belongs to a licensed electrician.
- Heating & Cooling
How furnaces, air conditioners and heat pumps work together with ducts and thermostats, the maintenance homeowners can do, and where HVAC work requires a licensed technician.
- Plumbing
How the plumbing in a typical house works, what you can safely fix yourself, and diagnosis-first guides for toilets, faucets, drains and water heaters.
- Walls & Paint
How interior walls and finishes are built, the repairs homeowners handle most often, and the hidden hazards in older homes, such as lead paint and asbestos, that change how you should work.
All repair guides
Appliances
- Dishwasher Not Cleaning Well: Spots, Film and Food Left Behind
- Dishwasher Not Draining: Clear the Filter, Hose and Air Gap
- Dryer Not Heating: Electric and Gas Dryer Troubleshooting
- Dryer Takes Too Long to Dry: Clean the Vent Before It Becomes a Fire Hazard
- Frost Building Up in the Freezer: Causes and How to Fix It
- Ice Maker Not Working: Water, Temperature and Shutoff Arm Checks
- Microwave Runs But Will Not Heat: Safe Checks and When to Stop
- Oven Not Heating: Electric and Gas Oven Troubleshooting
- Refrigerator Leaking Water: Find the Source and Stop It
- Refrigerator Not Cooling: Check These Before Food Spoils
- Washing Machine Not Spinning or Draining: What to Check
- Washing Machine Smells: Get Rid of the Musty Odor and Keep It Away
Electrical
- Breaker Keeps Tripping? Overload, Short Circuit or Ground Fault Explained
- Ceiling Fan Wobbling: How to Balance It and When It Is Unsafe
- Dimmer Switch Buzzing or Lights Humming: Causes and Fixes
- Doorbell Not Working: Button, Chime or Transformer?
- GFCI Outlet Won't Reset: Causes and Safe Fixes
- How to Replace a Ceiling Light Fixture
- How to Replace a Light Switch (Single-Pole and Three-Way)
- How to Replace an Electrical Outlet Safely
- Lights Flickering: Harmless Bulb Issue or Wiring Warning?
- Outlet Not Working? Check These Five Things Before Calling an Electrician
- Outlet Sparks When You Plug Something In: Normal or Dangerous?
- Warm Outlet or Switch: What It Means and What to Do Right Now
Heating & Cooling
- AC Freezing Up: Why Ice Forms on the Coil or Lines and How to Fix It
- AC Leaking Water Inside: Clear the Condensate Drain and Find the Cause
- AC Not Cooling: Step-by-Step Checks for Central Air
- Furnace Blowing Cold Air? What to Check Before You Call
- Furnace Making Noise: What Banging, Squealing, Rattling and Humming Mean
- Furnace Short Cycling: Why It Turns On and Off Too Often
- Heat Pump Blowing Cold Air: Normal Defrost or Real Problem?
- How to Change a Furnace Filter: Size, MERV Rating and How Often
- How to Clean an AC Condenser (Outdoor Unit) Safely
- Repair or Replace Your Furnace or AC? How to Decide
- Thermostat Not Working: Blank Screen, No Response or Wrong Temperature
- Uneven Room Temperatures: Why Some Rooms Are Too Hot or Too Cold
Plumbing
- Clogged Shower Drain: How to Clear Hair Clogs and Keep Them Away
- Clogged Toilet: How to Unclog It Safely (With or Without a Plunger)
- Frozen Pipes: How to Thaw Them Safely and Keep Them From Bursting
- Garbage Disposal Not Working? Humming, Silent or Jammed: How to Fix It
- How to Shut Off the Water to Your House (and Find the Valve Fast)
- Leaky Faucet: How to Find the Worn Part and Stop the Drip
- Low Water Pressure: How to Find Out Why and Fix It
- Slow Bathroom Sink Drain: How to Clear It Without Harsh Chemicals
- Toilet Keeps Running? How to Find the Cause and Fix It
- Water Heater Making Noise: Popping, Rumbling, Hissing and Ticking Explained
- Water Heater Not Producing Hot Water: Gas and Electric Troubleshooting
- Weak Toilet Flush: Why It Will Not Clear the Bowl and How to Fix It
Walls & Paint
- Drywall Cracks: Which Are Cosmetic, Which Are Warnings, and How to Fix Them
- Drywall Nail Pops: Why They Happen and How to Fix Them for Good
- How to Paint a Room: Preparation, Order of Work and a Clean Finish
- How to Patch a Hole in Drywall: Small, Medium and Large
- How to Recaulk a Bathtub or Shower So It Stays Sealed
- How to Remove Wallpaper (and When to Paint Over It Instead)
- Mold on the Bathroom Ceiling: Clean It, Fix the Moisture, Keep It Away
- Paint Finishes Explained: Flat, Eggshell, Satin, Semi-Gloss and Gloss
- Paint Peeling or Bubbling: Find the Cause, Then Repaint So It Lasts
- Textured and Popcorn Ceiling Repair: Patch, Match and Test for Asbestos First
- Water Stain on the Ceiling: Find the Leak, Dry It, Then Cover the Stain
How our guides work
Every guide follows the same order: a short answer, an at-a-glance box with difficulty, time and cost, a set of diagnosis questions that narrow the problem down, and then step-by-step fixes for each likely cause. Tools and supplies are listed before you start, and each guide ends with the public sources, such as agency guidance and manufacturer instructions, it was checked against. Read more in our research methodology and editorial policy.