I hold a 12 year ancient saniflo macerator which works, starts ok, but won't turn bad automatically any more. HELP!

HELP!
Answers:    12 years isn't bad service, I don't dream up it owes you anything, I would replace it.
The switch is probably gone bad. It could of late be a build up of stuff but I would replace it.

If you don't want to deal next to the mess hire a plumber.