What does the Haier dryer F5 error code mean?

I have a Model GDZ-10 Haier electric dryer that will not start every time. It will start maybe once in 50 tries. I can hear the motor "bump" but it will not turn the drum. I get an F5 error code if it does not start. If it does not start and I leave it alone, the digital timer display will first display "60" then display "28" after a minute or two Aminute or so later it will then display "1". If the dryer does start, it will run the entire cycle normally.