They hid the fuses so you have to take the sewing machine to service... or not... fingers crossed..."Elna model 6600 or 660 + Janome model MC4900QC - to diagnose if the fuse
has blown perform the following steps for the following error codes: “E1”,
“E2”, “E3”, and “E5” before doing anything else. Put the needle in the
highest position and then turn the machine on. If you get “E1”, turn the
machine off, put the needle in the lowest position, and then turn it back
on. If you get “E2”, the customer jammed the machine and it blew the 3.15A,
250V, white thermo fuse (#000182904) on the back of the 'A' board"