What to Do If Pleated Blinds Won't Raise or Lower

Pleated blinds stop raising or lowering for a handful of reasons: the cord has tangled inside the headrail, the cord lock has seized, a pleat has folded the wrong way and jammed the stack, or the cord itself has frayed and slipped out of position.

None of these are a reason to bin the blind. Most are a 10-minute fix with basic tools.

What You’ll Need

Tools

• Small flathead screwdriver
• Needle or thin blunt probe (a cocktail stick works)
• Scissors
• Step ladder or stable chair if the blind is high

Materials / Replacement Parts

• Replacement blind cord (match the diameter to your existing cord, usually 0.9mm or 1.2mm)
• Cord conditioner or dry lubricant spray (optional, but useful on older blinds)
• Replacement cord lock slider (if the existing one is cracked or seized)

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How to Fix It: Step-by-Step

Step 1: Find Where It’s Actually Stuck

Before touching anything else, figure out whether the problem is in the cord, the cord lock, or the pleats themselves. Pull the cord gently. If it moves but nothing happens, the cord has likely come free inside the headrail. If the cord won’t move at all, the lock mechanism is the culprit. If the blind moves slightly then jams, a misfolded pleat is the issue.

1. Hold the blind flat and look along the stack of pleats from the side
2. Check whether any pleat has collapsed inward or folded backwards
3. Look at the headrail ends where cords feed through, and check for visible tangling
4. Try pulling the cord from a slightly different angle to feel where the resistance is coming from

Getting the diagnosis right first saves you taking apart the wrong thing.

Step 2: Clear the Cord Lock

The cord lock sits inside the headrail and clamps the cord in place when you stop pulling. Dust, fluff and moisture can cause the locking pin to stick, which stops the cord moving in either direction.

1. Carefully lift the blind off its brackets and lay it on a flat surface
2. Locate the cord lock housing (usually a small plastic box clipped inside the headrail)
3. Use a flathead screwdriver to open the housing if it clips shut
4. Check the locking pin: it should move up and down freely with finger pressure
5. Clear any debris with the needle or probe, then test the pin movement again
6. If the pin is cracked or won’t spring back, replace the cord lock slider (they cost a few pounds and are sold by most blind parts suppliers)

Step 3: Rethread the Cord Through the Pleats

If the cord has slipped out of one or more pleats, the blind can’t fold or stack properly. This is fiddly but not difficult.

1. Lay the blind fully flat on a table
2. Follow the cord from the bottom rail upward, checking it passes through each cord hole in every pleat
3. Where the cord has jumped out, thread it back through using a needle or the blunt probe
4. Make sure the cord runs in a straight, vertical line through each pleat without crossing over
5. If the cord has frayed badly at any point, cut it clean and tie on a new length, or replace the full cord run

Don’t rush this step. One missed eyelet and the blind will jam again in the same spot.

Step 4: Rehang and Test Slowly

Once the cord is running freely and the cord lock moves as it should, rehang the blind and test it before calling the job done.

1. Clip the blind back onto the brackets
2. Pull the cord slowly to raise the blind, watching each pleat fold in sequence
3. Lower it again at the same pace, checking the stack doesn’t snag at any point
4. If the blind raises and lowers smoothly, apply a light spray of cord conditioner to the cord where it passes through the headrail (this reduces friction long-term)
5. If it still catches, go back to Step 1 and check for a pleat that’s folding the wrong way

A blind that jams in the same spot every time has a pleat problem, not a cord problem. Two different symptoms, same-looking result.