You can tell a garage door spring is broken with three unmistakable signs: a loud bang you heard recently (often when no one was using the door), the door won't open when you press the opener button, and a visible gap or separation in the torsion spring coil above the door. Most broken springs show all three. Don't try to operate the door if you suspect a broken spring — you can damage the opener or make the failure worse.

Sign 1: The bang. Springs almost always break when fully tensioned (door closed). The bang is loud — homeowners often think a tree fell on the house or something exploded in the garage. The sound is metallic and sharp. If you've heard it within the last 24-48 hours and now the door won't open, that's diagnostic.

Sign 2: Opener tries but door doesn't move. When you press the wall button or remote, the opener motor will hum, click, or try to engage — but the door doesn't lift, or lifts only an inch and stops. This is the opener's safety circuit detecting that the door is too heavy (because the springs aren't doing their counterbalance job). Some openers will give an error code on a connected wall console.

Sign 3: Visible gap in the spring coil. Stand inside the closed garage and look up at the torsion shaft above the door. You'll see one or two springs wound around the shaft. If you see a gap of 1-3 inches in the coil where the spring has clearly separated, that's the break. The spring may have unwound slightly in both directions from the break point. This is the visual confirmation.

Sign 4 (older extension-spring systems, single-car doors): one stretched / one slack. If your door has long springs running parallel to each track (extension springs, common on pre-2000 single-car doors), check both. A broken extension spring will hang noticeably looser than the intact one. Some break clean — you'll see a snapped end dangling.

What to do if you've confirmed a broken spring:

1. Don't operate the door. Don't keep pressing the opener button — you'll burn out the motor. Don't try to lift the door manually — it weighs 130-300+ pounds without spring assist and can crash down. Don't park your car under it.

2. Pull the manual release (red cord hanging from the opener rail) to disconnect the door from the opener. This protects the opener from further strain.

3. Call a professional. Same-day spring replacement is standard service in MA. We carry every common spring on every truck. Typical on-site time: 60-90 minutes. Cost in MA: $185-$395 (see our cost guide).

The pair principle reminder: if your door has two springs and one is broken, replace both. The intact one is at the same age and cycle count as the broken one — it's months from breaking, and emergency replacement of a second spring weeks later costs more than doing both at once. Same-day replacement available.