Step 1: Check for the classic broken-spring signs
If you heard a loud bang recently and the door now feels extremely heavy or won’t budge at all (with the opener straining or not moving the door), that’s the signature of a broken spring. Stop here — do not attempt to force the door open manually or repeatedly run the opener, since the door’s counterbalance system has failed and the door may be unsafe to move. This requires professional spring repair.
Step 2: If there was no bang, rule out simpler causes first
If there was no bang and the door simply isn’t responding, confirm the opener unit has power (check if its light turns on, and check the circuit breaker), and check whether the manual release cord has been accidentally pulled, disconnecting the trolley from the opener. If those check out fine and the door still won’t budge, a gradually weakening spring (rather than a sudden full break) is a reasonable next suspect.
Step 3: Look for visible spring coil separation
If you can safely see the torsion spring (mounted horizontally above the closed door), a visible gap or separation in the coil is a clear sign the spring has broken. This confirms the diagnosis but doesn’t change the next step — professional repair, not a DIY fix.
When to stop troubleshooting and call a professional
Any sign of a broken spring means it’s time to stop and call for professional spring repair rather than continuing to test the door manually or repeatedly run the opener against a failed spring. This situation involves stored mechanical tension that can cause injury or further damage if handled incorrectly.
Frequently asked questions
Is it safe to manually pull the emergency release if I suspect a broken spring?
No — the door may be extremely heavy without the spring’s counterbalance support, and manually lifting it in that state risks injury. Wait for a professional rather than attempting manual operation.
Can a weak (not fully broken) spring also stop a door from opening?
Yes — a spring nearing the end of its life can weaken enough that the opener struggles or stalls trying to lift the door, even before a full, sudden break. This still requires professional spring service rather than DIY adjustment.
Can cold weather alone stop a garage door from opening even without a broken spring?
Extreme cold can occasionally cause opener lubricant to thicken and slow operation, though a fully non-functional door is still most commonly a spring issue, especially if it coincided with a recent cold snap.