I switched off the power many times, but it did not work. It worked a few times before, then stopped. And what battery it has to be changed?

Susanna Petrosyan, April 2013

The memory battery should be changed every three years by the service centre. After three years, the machine may lose programming if unplugged and stored. Each time the battery is changed, the service technician should put a new battery reminder sticker on the machine. The battery will normally hold the program memory for around two months if the machine is unplugged. After that, it will need a full re-program

Registerman, April 2013