Should have on/off green neon light, but it may be faulty. Test with leaving on for 2hrs with freezer pack in freezer box if solid then it works but no neon light. If it doesn't freeze check socket of frige with mains radio see if current getting to te socket. If no turn off main open socket to see if wire/s loose. Check fridge plug for loose wires and or blown fuse.
Check feed to socket if no power at socket check socket feed cable back to sorce.
Basically trial and error.
Bob
May 2009