Opener Light Comes On But Door Won't Move — What's Wrong?
If your garage door opener motor hums or the light flashes but the door doesn't move, here's exactly what's failed and what it costs to fix.
Why does my opener light come on but the door won't move?
When the opener has power and lights but the door won't budge, you're looking at one of four issues: a worn drive gear, failed capacitor, stripped trolley carriage, or — most often — a broken spring fooling the opener.
Test it: pull the red release rope and lift the door by hand. If it slams down or stays stuck halfway, your spring is broken. The opener is fine — it just isn't strong enough to lift a 200 lb door without spring assistance.
If the door lifts smoothly by hand but the opener motor only hums for a few seconds, you have a bad capacitor. This $30 part fails commonly on LiftMaster and Chamberlain units after 8–10 years and is a 20-minute fix.
If the motor runs but the chain or belt doesn't move, the drive gear (Chamberlain/LiftMaster) or trolley carriage has stripped. Gear kits run $90–$140 installed.
Key takeaways
- Pull the release rope first to test the spring
- Hum-only = bad capacitor ($30 part, 20-min fix)
- Motor runs but no chain movement = stripped drive gear
- Most opener problems aren't worth replacing the whole opener
Need a real garage door tech in Angier, NC?
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Email office@angiergaragedoorrepair.com