G'day Vera
Assuming that you have no test equipment, the basic method that would be
used by a serviceman would be to start with testing the element for
continuity and resistance to 'ground'. This can be done in situ but with
the
lack of equipment you are stymied. The other option would be to remove the
element and take it to be tested. From the description of the fault it
sounds likely the element has failed and the first step would be to test
it.
There also could be a problem in the wiring instead but once again you
will
need some experience to check it, along with the equipment. I can only see
1
jpg of the bottom of the element/fan in the link.

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Lack of test equipment shouldn't be an issue, one can pick up a suitable
multimeter for $10-$20, maybe less these days and it'll come in handy for
other things too.