Jill,
Check the circuit breakers in the main panel. Some electric furnaces
will have more than one breaker feeding it. An electric furnace will
be powered by 240 volts, so it will be fed by 2 pole breakers. Many
electric furnaces have fuses in them. If you can't test the fuses, you
can jusat replace them, but it is best to remove them and test them
with a continuity tester. Turn the power off at the breaker panel
before you remove the fuses. They will be 30 amp and 60 amp cartridge
fuses. This is common in manufactured housing.

Past that will require a service technician. Could be a bad element,
bad heat sequencer, bad wire, bad limit..... You get the idea.
Repolacing these parts is not a DIY job.

Good luck

Stretch