What Does This Error Mean?

A Brother automatic needle threader that misses the needle eye is usually slightly misaligned after the needle or needle clamp was moved. Re-insert the needle so the flat side faces the back, ensure the needle is pushed all the way up into the clamp, and try the threader again. The threader hook is delicate — do not force it.

Affected Models

Brother SE700
Brother CS7000X
Brother HC1850
Brother XR9550
Brother CP60X
Most Brother computerised and mechanical models

Common Causes

Needle not inserted all the way up into the needle clamp
Needle flat side facing forward instead of backward
Threader hook bent from incorrect use or being forced
Wrong needle size — very fine needles (size 60/8) are too narrow for the threader hook
Needle clamp screw loose — needle position shifts during sewing

How to Fix It

Re-insert the needle correctly.

Loosen the needle clamp screw and remove the needle. Insert the needle with the flat side (the non-grooved side) facing directly toward the back of the machine. Push the needle up as far as it will go before tightening the clamp screw. Even 1mm of insufficient insertion throws the threader hook alignment off.
Lower the needle to the correct position.

The automatic threader only works when the needle is in its fully raised (home) position. Turn the hand wheel toward you to raise the needle to its highest point before activating the threader lever.
Use the correct needle size.

The automatic threader is designed for needle sizes 75/11 through 90/14. Very fine needles (60/8 or smaller) have eyes too narrow for the hook to enter. For delicate fabrics requiring fine needles, thread the needle manually.
Follow the threading path exactly.

The thread must be looped through the small thread guide on the threader mechanism before engaging the lever. Consult your Brother manual's threading diagram. If the thread is not routed through the guide, the hook pushes through but the loop is not formed.
Check the threader hook for bends.

Look closely at the small metal hook at the end of the threader lever. It should be a smooth, straight wire with a tiny hook at the tip. If it is bent sideways, use very fine tweezers or pliers to gently straighten it. A bent hook passes through the eye at an angle and misses the thread.

When to Call a Professional

If the threader hook is visibly bent or broken, it is a small metal part that can be straightened carefully with fine-nose pliers. If broken off, a replacement threader assembly is available from Brother parts suppliers.