Samsung RSH1DBBP Ice Maker Problem

Hi

I have recently bought a Samsung RSH1DBBP Fridge Freezer (for £250) from the Regional Repair Center

I was led to believe it was in full working order, (just a little dented along the sides)

After having in plumbed in I have noticed that the ice maker doesn’t produce ice automatically

Water fills the ice tray and once frozen as I understand it a sensor underneath the ice tray should make the ice tray rotate and the ice should then fall into the ice collector

Unfortunately the only way I can get ice into the ice collector is by pushing the reset/test button underneath

(This results in the ice tray rotating a little over 90 degrees, the right hand side twists down first, (it doesn’t go down in parallel))

I had an engineer round from the place where I bought the freezer from who replaced this part DA97-07621B EVAP

Despite dropping the temperature of the freezer to -25 still no ice is automatically produced

The Engineer also re-gassed the compressor

Any ideas as to why the Ice Maker doesn’t work? and what parts I need to get it working again?