There are time you may need to change a parameter in your dryer inverter. This video will show you how to change the F1-09 and F1-10 parameters.
If you find your dryer drum is not spinning but the other dryer functions are working, check your inverter and see if there is an error on it. If you find you are getting OCA errors on your inverter, you can change these 2 parameters to fix things.