I installed the VPT24-1PZ according the wiring instructions and programmed the switch. Everything worked perfectly for about 2 weeks. When I decided I wanted to change the programming, I open the cover and when I pressed the "set" button the display went blank. After a few minutes it started flashing, faster and faster until it was back to the full display, however it is not working and if I touch any of the button it goes back blank and then stats flashing again. What is wrong and how can this be fixed?
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