Symptoms
- Pulling the cord does nothing
- Blind raises partially then stops
- Slats bunch up unevenly
- Cord feels loose or slips
Likely causes
- CommonTangled or knotted lift cordsCords inside the headrail can twist around each other, especially after repeated raising and lowering.
- CommonBroken lift cordCords fray and snap with age and use.
- PossibleCord lock mechanism jammed or wornThe small cleat or lock inside the headrail can wear out or get gummed up with dust.
- PossibleSlats caught on the bottom rail or each otherBent or misaligned slats can jam against one another while raising.
What to do
- Lower the blind fully first to see the cord path clearly and check for obvious tangles.
- Gently pull each cord individually to identify if one side is stuck or slack compared to the other.
- If cords are tangled inside the headrail, remove the headrail cover (if accessible) and carefully untangle them by hand.
- For a broken cord, most blinds can be restrung with a repair kit matched to your blind's width and cord type.
- Clean dust out of the cord lock mechanism at the top with a small brush or compressed air.
- Check the bottom rail and slats for any that are bent or caught, and straighten or realign them.
- Test raising and lowering fully several times once repaired to confirm even movement.
Tools and parts
- Small brush
- Screwdriver
Blind restringing cord kitSearch: “mini blind restring cord kit”
When to call a pro
Call a blind repair service or replace the blind outright if the headrail mechanism itself is broken, since replacement parts for that are less commonly available.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.