We have a number of storage heaters in our office, all on the same circuit
(with seperation for convectors/fans and the heaters)

Two of the heaters do not work.

One has no fuse at the wall switch and a single wall switch.

The other, more important one has two wall switches, one for the heater and
one for the convector, they are both switched on, the convector comes on but
the heater is not working.

Is there likely to be a simple fuse inside I can change?

Thanks

David