Signs Your Garage Door Is Out of Balance (and How to Check)

Balance is one of the most important things about a garage door, and one of the least understood. A balanced door is easy on the opener, quiet and safe. An unbalanced one wears parts out faster and can be a warning that a spring is on its way out.

What balance means

A garage door is heavy. The springs, not the opener, carry almost all of that weight. They are set so the door feels close to weightless. When the door is balanced, you could lift it by hand with little effort, and it would stay put at any height.

The opener only guides the door up and down. When the springs stop doing their share, the opener has to lift the extra weight, and that is where the trouble starts.

Why doors go out of balance

• Springs wear. Springs lose tension slowly with use. Over time, they carry less of the door's weight.
• A spring breaks. On doors with two springs, one can break and leave the other doing all the work.
• Cables stretch or slip. Uneven cables can let one side sit lower than the other.
• The door got heavier. Added windows, insulation or hardware change the weight the springs were set for.

Signs your door is out of balance

• It feels heavy. With the opener disconnected, the door is hard to lift by hand.
• It won't stay open halfway. It drops down or rises up on its own.
• It closes too fast. It drops quickly or hits the ground hard. See garage door closes too fast or slams.
• It sits crooked. One side is higher than the other, or there is a gap at one end of the bottom edge.
• The opener strains. It sounds louder, runs slower or stops and reverses for no clear reason.
• The springs look uneven. On doors with springs along the sides, one may look more stretched than the other.
• It shakes or jerks. The opener pushes and pulls against the door. See why your garage door shakes or jerks.

How to test balance safely

Only do this test if the door seems to be working normally. If it feels very heavy, you heard a loud bang, you can see a gap in a spring, a cable looks frayed, loose or off its drum, or the door hangs crooked, skip the test and call a professional.

• Close the door fully.
• Pull the red emergency release cord so the door is off the opener. Only pull it with the door fully closed.
• Lift the door by hand to about waist height. Keep your feet clear of the bottom edge.
• Gently let go, with your hands ready to catch it.
• Watch what it does. A balanced door stays about where you left it, or drifts slowly.

If it drops quickly or rises on its own, the door is out of balance. Lower it carefully, reconnect the opener following your manual and stop there.

Why the fix is not DIY

Fixing balance means adjusting spring tension. Torsion springs are wound with a lot of stored energy, and side springs are stretched under heavy load. The cables and the bottom brackets at the lower corners of the door hold that same tension. If something slips, it can cause serious injury.

Don't loosen, wind, unhook or pry on springs, cables or bottom brackets. Don't adjust the opener's force setting to make up for a heavy door either. That can stop the door from reversing when something is in its way.

Our post on garage door spring warning signs explains more about why spring work belongs to a professional.

Why balance is worth keeping right

• Your opener lasts longer. It isn't lifting weight it was never meant to carry.
• Other parts wear less. Rollers, hinges and cables carry a more even load.
• The door is safer. A balanced door is easier to control by hand in a power outage, and less likely to drop.
• It is quieter. Less strain usually means less noise.

Our post on how long springs and openers last explains how balance ties into the life of each part.

How often to check

The hand test fits well in a seasonal routine, a few times a year. A professional should check and adjust balance once a year as part of a tune-up. You can see what that covers in what a garage door tune-up actually checks.