Sorry for the long delay in answering your question.
Unfortunately, it's bad news, so I suspect no one wanted to impart the information
Error 7 is a motor circuit error.
The motor and/or main control board will be at fault.
It may be worth checking the motor plug and wiring, just in case, but, in most cases we have to replace both the motor and the control board.
Unplug the appliance, take the rear panel off.
Check the motor plug and the wiring to it.
If all ok, sorry, you are looking at an expensive repair on your machine.
Check it out, see how it goes and get back to me if you need more help.
Hope this helps