Troubleshooter

What's going on at your place?

Start with what you're seeing, not the name of the repair. Answer a question or two and you'll get the most likely causes in the order worth checking, with the time, cost and difficulty of each fix.

  • 70 problems covered
  • 1 to 3 questions
  • Checks in order
Woman shining a flashlight into a bathroom vanity at a damp spot under the drain

Water pouring, gas smell, sparks or a CO alarm? Emergency steps

    Common problems

    How it works

    The questions are a decision tree we wrote from our own guides: each path ends at the guides whose causes match what you're seeing.

    The checks are ordered the way we'd check them ourselves: the most common cause first, and the easy, free checks before the ones that take parts or tools. A few answers go straight to a safety warning instead, because gas, sparks and water through a ceiling come first.

    It narrows things down; it can't see your house. If the first check doesn't turn it up, the next one on the list is the next most likely.

    About this tool

    Who it's for

    For when you know what you're seeing but not what the repair is called.

    Example

    You enterWater under a sink, only while it drains

    You getCheck the drain side first: the P-trap's slip nuts, the tailpiece or the strainer, then the drain itself.

    What's different

    • Starts from the symptom and narrows it with one or two questions.
    • Puts the checks in the order that's worth doing them.
    • Shows time, cost, difficulty and pro price for each.

    Gotchas and tips

    • If anything involves gas, sparks or water through a ceiling, stop and use the emergency steps.
    • Some problems have more than one cause; check each in order.
    • The page link keeps your answers, so you can send it to someone.

    Privacy: Runs entirely in your browser. Nothing you type is sent to us, and anything it remembers is saved on this device only.

    Built and maintained by the GrabTheHammer team, using the same time, cost and safety notes as our guides. Updated November 2026. Spot a problem? Tell us.

    Troubleshooting questions

    How do I figure out what's wrong with my house?

    Start with where and when it happens. A leak that appears only while a faucet runs has a different cause than one that's there all the time. Narrowing it down first saves buying parts you don't need.

    When should I stop and call a pro?

    Gas smells, sparks or burning smells, water coming through a ceiling, and anything structural. Each guide also lists the specific signs that it's time to call someone.

    What if my problem isn't listed?

    Try searching the guides, or start from the room or system on the homepage. If you're hearing something odd, the house noises page sorts problems by sound.

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