If it's of any reasonable quality it will have a Thermal Fuse - your Thermal Fuse may have popped - you might mend it yourself or have a technician see to it.
I just guess -
https://www.youtube.com/watch?v=pRoryTFM8hM
Good Luck..., January 2017
edit
I can answer this question...
how can I fix my eternal 2KW CSTD convector heater?