Pfaff GrandQuilter Owner's Manual page 40

Maintenance and troubleshooting
Seam puckering
The needle thread is not threaded properly.
The needle is too heavy for the fabric being sewn.
The stitch length is too long for the fabric.
The needle thread tension is too tight.
The cloth is not fed smoothly
The feed dog is packed with lint.
The stitches are too ne.
Loops on the seams
The needle thread tension is too loose.
The needle is too thick or too ne for the fabric.
The machine does not sew or run
The machine is not plugged in.
Thread has been caught in the hook race.
The machine is noisy
Thread has been caught in the hook race.
Lint has built up in the hook race or bobbin holder.
The machine needs oiling.
Important notes: Before changing presser foot and needle you must turn the main
switch off. Do not attempt to sew without fabric under the presser foot.
When leaving the machine, even for only a short time, switch off the main switch.
This is important if there are any children nearby.
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