You have a faulty door lock
When you select a new cycle the door should lock and it doesn't. The flashing lamp is a lock sign
This is fairly easy to replace yourself.
Please go here
( Just click on the word in blue)
This is the part you need and you can order it there.
At the bottom of the page is a video showing you how to do it.
If you prefer an all in quote for the repair, please let me know
If you need more help, please just ask me.
In the meantime,
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If you need to ask me anything after rating, please just follow the link in the welcome email