Using dishwasher on Yom Tov /shabbos

Can I set the timer Erev Shabbos and keep opening it to put dirty dishes in after the first Seder
And can I set it to go on 2nd Day Yom tov any time I want…or are these questions not answered here…

Yes, you can.

To clarify,
Is this only ok on yomtov or can I set my dishwasher before shabbos to wash the dishes from Friday night?

Thank you

Shabbos as well.

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If I set the timer before shabbos/yomtov a small pinprick light will appear on the door and changes if the door is opened etc
I do not care about the light, it is too small to be useful and the light is on in my kitchen anyways.
Is this an issue?