I just pulled the cover off the machine to check the over temp breaker on the brew boiler and as I suspected it was tripped. I reset it and powered up the machine it seemed to be ok again, but then the problem came back.
So I had a look around inside the machine only to discover that there was water at the bottom of the machine. Further investigation provided the answer to the problem, water has been leaking from the coupling behind the steam wand and dripping onto the temperature controller(there is dried water and muck on top of it).
I guess Ill send it back to Expobar and ask for an upgrade to the PID on the Minore III. Ive nipped up the thread on the back of the steam wand but unfortunately the damage is already done. The quality control on this machine is terrible I had a similar problem on the other side(behind the hot water tap) a few months ago.
I hope it can be fixed permanently, at least its still under warranty.