Do you know how to use an electrical test meter? If yes, check the
thermostats and the heater elements, if it is electric. If it is gas,
check the thermostat and also the electric part of te gas valve. If
you don't know how to use testers, then you need to call someone who
does.

You may look for a reset button and press it, it may have one in the
control compartment. If your dryer is propane check to see if there is
propane in your tank.

Not enough information given for a good answer.

Stretch