how can I fix my oil filled radiator? ?

J use my radiator intermittently, but yesterday it ceased to work. Usually, in orderto turn it on, I turn the 24 hour time clock by hand until it reaches the 2 or 3 hours' worth of pushed-out notches, when the lights on the min and max switches light up. The radiator immediately sends out heat. Now the switches do not light up, and there is no heat. The fuse is OK, as is the electrical supply.
De Longhi SPA CAT NR TYP 082021
230-240V - SOHz Serr Nr 8 3906