Could be the cotton on the spool has come off.
Look at section you've put your question in.Copy and paste to freezers its under main heading kitchen appliances.
However a few factors, motor knackered, needs re-gasing or the thermostat knackered.
CA
January 2011
Automatic Answer
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howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix sewing machines.