If you remove the back cover at the bottom there you will see the compressor (black pot). Feel this and see if its hot to touch and let me know.
Also is the clciking noise comming from the compressor as well?
No worries glad to hear you found the fault. Thats where i was leading to as when the relays fail you get the clicking as the compressor cannot start correctly so clicks off.
Fingers crossed the relay will cure it for you but if it doesnt and you still have the same fault then im afraid its the compressor itself faulty here. But most of the time the starter relay fixes the fault.
If you need anymore info just get back to me.