Had this issue with our Ultra Wash Dishwasher. We've had it 12 years with no problems. Tried the holding different buttons for 4-6 seconds and sequential buttons with no results. Tried cutting power off and then on. No luck.
Fkucera gave me the idea to disassemble the inside panel of the door (three screws on the sides and 2 at the latch) to lift it from the front, then lifted the black cover off (trigger points at left and right sides) the electrical area to access the door latch assembly. I jiggled that loose from the door to take a look and it was a bit sticky. Instead of using an air compressor, I dipped a soft bristle toothbrush in rubbing alcohol and liberally cleaned all moving parts and crevices. Hold it over a dish to catch the drips. I wiped it dry with a paper towel real good, blew a little over it to help evaporate the alcohol, then began to put it all back together.
As I was assembling it back, I took notice of how (at the top center on the box side) the metal tab will slide up the black plastic bit and snap down to engage the mechanism (white plastic) that pops the handle as you close the door. It is entirely possible that the tension was not enough to snap it far enough down. I adjusted the tab ever so slightly down. We waited a little longer before restoring the power, just to be certain it was completely dry. I am happy to report the light was no longer flashing! I am running a load of dishes as I am writing this note! Good Luck!!
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