Sorry. I'm new at this.

It doesn't matter what setting that it is on. When turning left, the
blower will blow according to the setting on the control panel.

Sometimes, it will continue working for 4-5 minutes and then go off
again. When it goes off, I can hear a humming sound as if it is trying
to run. Turn a left, and it kicks on again.

This weekend, it completely quit. There was no sound and no air no
matter what. Then today I got up and it was miraculously working again.