SOURCE: My sylvania lcd flashes green 20 times but won't
The other answer is a little simplistic to say the least. A model number might be helpful but here is a general answer and not a one line comment.
Sounds like a poor connection in the control or a faulty control module, I would return it as faulty for a new one. They seal those units up pretty good so we can't fiddle with them. Everyone gets a lemon sometimes.
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