Janome Memory Craft 6700P Instruction Book page 103

Warning Sign Cause
The twin needle key is pressed when a pattern unsuitable
for twin needle sewing has been selected.
The twin needle has to be replaced with a single needle.
The machine is started without lowering the feed dog with
basting or button sewing selected.
The machine is started with the feed dog lowered.
The needle plate is removed.
The machine is halting due to the overload.
101
Try this
Select the pattern suitable
for twin needle sewing.
Replace the twin needle with
a single needle, then press
the twin needle key.
Lower the feed dog.
Raise the feed dog.
Attach the needle plate.
Check if the needle plated is
attached properly.
Wait for at least 15 seconds to
restart.
Remove tangled threads
around take-up lever, hook
race and automatic thread
cutting mechanism.
Check also if the needle is
bent or the fabric is too thick.