You're half way there. Switch off, set dial to black dot, switch on and any programming should cancel. Switch off, set programme, switch on and wait for fault. When the dial starts to revolve, count the flashes of the power lamp - they will cycle in a group of flashes. If you can post the number, we can link them to the list of faults and give you some guidance.
Which bit of "Unplug it" is causing the problem?
Stop eMailing me. This is a perfectly good forum - use it!