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Re: "check top thread" warning, but top thread is...
The upper thread sensor may be bad or need cleaning off but this doesn't happen very often. What does happen is that the thread regulating spring (the spring that the thread goes through just before going up to the take up lever) has come out of a small grooved piece it fits through. By taking the side cover off you should be able to see this and possibly be able to pop it back in. A tiny amount of super glue can keep it from happening again.
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Check your stitch sample. Is it the bobbin thread that is making a thread mess, or is it the top thread throwing thread globs under the fabric? Usually, if there is a thread problem under the fabric, it is a top thread issue.
Remove the top thread completely from the machine.
Install a brand new needle
ALWAYS RAISE the presser foot and rethread from the beginning. Verify the thread path is correct.
Retest your machine and tweak the tension, as needed. If top thread is showing under the fabric, tighten the top tension. If the bobbin thread is showing on the top of the fabric, loosen the top tension. Tension is correct when the two threads meet in the middle of the fabric.
Which thread on your sewing machine are you referring to? With either the top thread or the bottom (bobbin) thread, the problem is most likely due to the tension.
Another reason for the top thread breaking could because the machine is not threaded correctly.
If you have the owner's manual for your sewing machine, check it for the settings for the top thread tension and for the correct threading. Also, check the manual for information on the bobbin (bottom) tension.
When your bottom thread is messy it is the top thread needing adjustment. Your machine may not be threaded properly and the thread may not be sitting correctly between the tension discs.
Check to make sure your machine is threaded correctly.
Check thread between the tension discs.
After checking, adjust the tension (tighter) and do a test. If it is still messy add some more tension and do another test.
Install brand new needle(s). Make sure the needle eye is the appropriate size for the thread you are using. Check that the needle is the correct type for the fabric & thread, ie coarse (abrasive) fabric would benefit from the protection of a top stitch needle which has a larger scarf.
Sometimes the thread is being held back in the thread path causing the needle to wear and shred the thread. Check that the upper tension is correct. ALWAYS RAISE the presser foot when threading the top thread. Make sure the upper thread follows the correct path and that it is not threaded incorrectly or looped around the spool pin or a thread guide.
In case you are unable to view--here is the text:
The Singer 7256 Fashion Mate sewing machine has a top drop-in thread bobbin and an automatic needle threader. The digital display on the side of the machine is used to select different stitch settings on the machine. When the display reads error code E2, it means that there is a bobbing threading error, which may be caused by the thread looping or bunching under the fabric as you sew.
Things You'll Need
Push the bobbin-winding spindle of the sewing machine back to the left.
Turn the hand-wheel toward you, hold the needle thread (thread on the sewing machine needle) and tug it lightly as the needle goes down and then raises up. A small loop will raise up through the needle plate on the sewing machine. Use the tip of a pen to lift the loop up through to the back of the machine.
Check the position of the needle. It should be seated in the sewing machine with the flat side facing the back of the machine. If it is not, remove the needle and reinsert it so that it is facing the correct way.
Remove the bobbin case. Use a screwdriver to turn the screw on the side of the bobbin until the loops of thread pull taught and are removed.
Remove any loose fibers or threads that may be stuck in the tension disks.
Reset the upper tension disks. Raise the presser foot lever up. Put the tension setting of the sewing machine on setting "4." Hold onto the spool of thread in your right hand and with your left, route the thread down through the tension channel, around the bottom of the disk and up the other side. When done correctly, the thread will click into place and slip in between the tension disks.
Set the thread bobbin in the bobbin case, with the thread passing over the top of the bobbin and then down to the right. Route the thread through the notch located at the left of the bobbin case and pull it through. Move the thread over the top of the throat plate and over to the back of the machine.
Tips & Warnings
Using incorrect bobbins may cause error E2 to occur. Not all plastic bobbins are the same size, so check the model number of the bobbin to ensure that you are using the correct one with your sewing machine.
Never turn the hand-wheel on the sewing machine away from you, as it will change the timing on the sewing machine.
A sewing machine operator can often help themselves when their machine does not operate properly. Here are some simple instructions, which if properly used can save time and mechanics service calls. TROUBLE;UPPER THREAD KEEPS BREAKING; This could be trouble;================Do this; 1.Top tension to tight================loosen tension 1 turn 2.Machine improperly threaded=========check threading 3.Thread twisted on guide post========" 4.Thread twisted out of tension=======" 5.Take up spring bent or broken=======Check action of spring 6.Thread jumped off pull off finger===Check threading 7.Needle bent or burred===============new needle 8.Bad cone of thread==================try another cone TROUBLE;LOWER THREAD KEEPS BREAKING; 1.Bobbin tensionspring to tight=======Loosen tension slightly 2.Bobbin threaded wrong===============check threading 3.Bobbin wound to tight or uneven=====try new bobbin 4.lint or thread on bobbin case=======clean inside case 5.Lint or thread inside hook==========clean inside hook 6.Bobbin case nicked bent or burred===check/change case TROUBLE;MACHINE STARTED SKIPPING STITCHES; 1.Needle bent or burred===============change 2.Needle set in crooked===============Check 3.Thread jumped off take up spring====check threading 4.Thread jumped off pull off finger===check threading TROUBLE STITCHES SHOWING LOOPS; 1.Forming loops on top of cloth=======Tighten bobbin tension ======================================or loosen top tension. 2.forming loops on bottom of cloth====Tighten top tension 3.Bobbin placed in case incorrectly===remove and replace 4.Bobbin thread slipped from under====check threading of tension===============================bobbin case 5.Lint or thread in top tension=======clean between tension discs
I would suggest to check the needle to see if it's damaged
also check to make sure the machine is threaded correctly,,that the thread is in every thread guide
also some sewing machine have a problem with the top thread coming off the thread take up lever
also I would check the bobbin area for lint or any loose threads
also check the top thread tension to see if it's set correctly
also the hook race cover & hook need to be taken out & cleaned & then put back in
some machine have had problems with the hook getting grooves worn into them & need to be fixed or replaced
start with a deep clean and oil. check tensions, top and bottom-stitch should "lock" inside the fabric. make sure you use same thread on bobbin as on the machine. Check needle for nicks or bent. Make thread is threaded correctly, passing through upper tension plate. check tension plate(upper) for rust or lint.